Many science fiction stories tell about explorers arriving in a new world. The explorers then use some kind of high-tech device to test for breathable air or signs of life. But here on Earth, science fiction is becoming reality through a new sampling technology called environmental DNA, or e-DNA for short. Scientists can use it to identify rare or invasive species, study bio-diversity or estimate fish populations with just a little air or water.
Ryan Kelly is an ecologist at the School of Marine and Environmental Affairs at the University of Washington in Seattle. He works in a laboratory there with other researchers. They study the genetic material released by living creatures. “Essentially we can take a sample of soil or air — and in our case — water, and we can sequence（to arrange the order of genes）the DNA out of it and tell you what is there.”
Ryan Kelly says he and his research team are studying water samples collected from Puget Sound. He says the cost of gene sequencing has “been reduced greatly in recent years.” That makes DNA testing more widely available.
Environmental DNA can be used in two ways. One is to identify the creatures that live in a certain place. The other is to confirm the presence or lack of a specific creature.
Caren Goldberg heads the new e-DNA lab at Washington State University in Pullman, Washington. She is one of the first biologists in the northwestern United States to take the technology from the testing phase to actually using it.
“It is extremely useful for species that are really hard to find. I have spent many hours looking for species that I was pretty sure were there — looking under rocks, looking in water, doing all kinds of surveys.”
Caren Goldberg sees e-DNA as a way to get answers more efficiently, safely and with less destruction compared to traditional survey techniques. Until recently, scientists depended on diving deep, netting or using an electric current to temporarily catch fish.
“We’re absolutely at this point where proof-of-concept has been established. I don't think everyone necessarily is ready for it yet, but I think the majority of people are.”
This newer way to identify what lives in the environment is becoming popular around the world. Animal experts in Vietnam are using the e-DNA to find the last, wild Yangtze giant softshell turtles. One researcher on the Caribbean island of Trinidad is using the sampling technology to find endangered golden tree-frogs. And in Madagascar, it is being used to identify amphibian diseases.
Ms. Goldberg has used e-DNA testing to confirm the local extinction, disappearance, of a leopard frog in the American state of Idaho. She has also been asked to document the spread of the New Zealand mud-snail in the state of Washington. The creature has been found in lakes and other waterways across the state.
Now, the U.S. Bureau of Land Management wants Caren Goldberg to look for the Columbia spotted frog in two other western states. The rare amphibian is a candidate for the federal government's threatened species list.
Scientists working with the technology say they do not expect robots to replace field biologists anytime soon. But the old-fashioned field work could soon be more targeted.
A related research goal is to show how long environmental DNA can last and how far it can travel in different environments.Paragraph One is intended as _____ of the passage.
| A．the main idea |
| B．the introduction of the topic |
| C．a supporting detail of the main idea |
| D．a contrast of the main idea |
What has made E-DNA magic is that with E-DNA_____.
| A．you are likely to find information about a species with a little air, water, or soil |
| B．some kind of high-tech device can be used to test for breathable air or signs of life |
| C．you are able to get answers more efficiently, safely though with more damage |
| D．the cost of gene sequencing has been reduced greatly in recent years. |
So far, the technique of E-DNA has NOT helped scientists search for ______.
| A．wild Yangtze giant soft-shell turtles |
| B．endangered golden tree-frogs |
| C．the local extinction of a leopard frog |
| D．the spread of the New Zealand mud-snail |
Despites its advantage, we are still not sure of something about E-DNA. That is _____ .
A. the lasting time and the spreading area of E-DNA
B .the lasting time of E-DNA and too many species for E-DNA
C. too many candidates for E-DNA and the lasting time of E-DNA
D. robots and old-fashioned field work’s replacing E-DNAThe passage can be sorted as a(n) _____.
| A．science fiction | B．experiment report |
| C．science report | D．bio-diversity discovery |
Across the world, 1.1 billion people have no access to clean drinking water. More than 2.5 billion people lack basic sanitation (卫生设备).
The combination proves deadly. Each year, diseases related to inadequate (不充足的) water and sanitation kill between 2 and 5 million people and cause an estimated 80 percent of all sicknesses in the developing world. Safe drinking water is a precondition (前提) for health and the fight against child death rate, inequality between men and women, and poverty.
Consider these facts:
The average distance that women in Africa and Asia walk to collect water is 6 kilometers.
Only 58 perc
ent of children in sub-Saharan Africa are drinking safe water, and only 37 percent of children in South Asia have access to even a basic toilet.
Each year in India alone, 73 million working days are lost to water-born diseases.
Here are three ways you can help:
(1) Write Congress
Current US foreign aid for drinking water and sanitation budgets only one dollar per year per American citizen. Few members o
f Congress have ever received a letter from voters about clean drinking water abroad.
(2) Donate to a project with a faith-based organizations
Many US religious groups already donate to water and sanitation projects, working with partner organizations abroad. Simply a single project by a US organization can make safe water a reality for thousands of people.
(3) Support nonprofit water organizations
Many US-based nonprofits work skillfully abroad in community-led projects on drinking water and sanitation. Some organizations are large, others small, some operate worldwide, others are devoted to certain areas in Africa, Asia, or Latin America. Support them generously.The passage is probably written for .
| A．Americans | B．people in developing countries |
| C．religious leaders | D．nonprofit water organizations |
What is the problem that the facts exposed?
| A．Inequality between men and women. |
| B．Many people have no access to clean drinking water. |
| C．Less effort has been made to improve the basic sanitation. |
| D．Children suffer most from the lack of basic sanitation. |
The purpose of the passage is to arouse people to .
| A．help the developing countries |
| B．help solve the water shortage and sanitation problem |
| C．support nonprofit water organizations |
| D．help get rid of water-related diseases around the world |
Which is the best title of the passage?
| A．From Water Shortage and Sanitation to Poverty |
| B．Developing World, A Place Needs Help |
| C．Water Shortage and Sanitation, What Can We Do? |
| D．Water Shortage and Sanitation |
Australia’s Great Barrier Reef will lose most of its coral cover by 2050 and, at worst, the world’s largest coral system could collapse by 2100 because of global warming, a study recently said.
The study by Queensland University’s Center for Marine Studies, commissioned (委托) by the Worldwide Fund for Nature, said that the destruction of coral on the Great Barrier Reef was unavoidable due to global warming, regar
dless of what actions were taken now. “Under the worst-case scenario, coral populations will collapse by 2100 and the reestablishment of coral reefs will be highly unlikely over the following 200-500 years,” said the report entitled “Implications (可能的影响) of Climate Change for Australia’s Great Barrier Reef.”
The Great Barrier Reef is the world’s largest living reef formation stretching 2,000 km north to south along Australia’s northeast coast. “Only if global average temperature change is kept to below two degrees Celsius can the Reef have any change of recovering from the predicted damage,” the report said. Coral has a narrow comfort zone and is highly stressed by a temperature rise of less than one degree Celsius. Water temperature rises of less than one degree coincided (同时发生) with the world’s worst recorded coral bleaching (颜色变淡) period in 1988. The warmer water forces out the algae (海藻) that give coral its color and, if all are lost, the coral dies and the reef will die out. In 1988, 16 percent of the world’s coral died, with 46 percent of the Indian Ocean coral destroyed.
Scientists express water temperatures to rise this century by between two and six degrees Celsius. “There is little to no evidence that corals can adapt fast enough to match even the lower temperature rise,” said the report. Over-fishing and pollution from coastal farms were also contributing to the destruction of coral on the Great Barrier Reef.
The Great Barrier Reef supports huge fishing and tourism industries. Even under favorable conditions tourists would only be able to experience real corals in reef “theme parks”.The underlined word “scenario” in Paragraph 2 probably means .
| A．imagination | B．intention | C．expectation | D．prediction |
From the passage, we can infer that .
| A．corals have no difficulty in adapting the temperature change |
| B．if we take quick actions we can avoid the destruction of corals |
| C．we can find corals in many areas of the seas or oceans |
| D．the algae help corals to live |
Which of the following is NOT the cause of the destruction of coral on the Great Barrier Reef?
| A．Direct sunshine. | B．Over-fishing. |
| C．Global warming. | D．Pollution. |
By saying “Coral has a narrow comfort zone” (Para. 3), the author means .
| A．coral can only live in a small area |
| B．coral prefers a crowded place |
| C．coral can hardly adapt to the temperature change |
| D．coral grows best in a small area |
Singles Day falls on every November 11th, and as the name indicates, this relatively new holiday is one specially for people who are still living the single life. I was a bit surprised when I googled “Singles Day” on the Internet, to find that China is the only country in the world that has set up a special day for singles to celebrate their lives.
An old story goes that once there were four single men, leading very boring lives. None of them were married, or had lovers, or did anything exciting. They just sat around all day and played Mahjong. One day they played Mahjong from 11 in the morning until 11 at night. During the game, no matter who won, the winning card was always the “four columns” card (the card shows four independent, parallel columns in two lines). Even more of a coincidence, it was Nov. 11. In order to remind them of the day, they nicknamed it Singles Day.
Singles Day was first celebrated at various universities in Nanjing, capital city of Jiangsu Province during the 1990s. These college students carried their university tradition into society after they graduated. Singles Day is now a special day for all.
The main way to celebrate Singles day is to have dinner with your single friends, but it’s important that each person pay their own way to show their independence. People also hold “blind date” parties in an attempt to say goodbye to their single lives.
For breakfast on Singles Day, singles often eat four youtiao
(deep-fried dough sitcks) representing the four “ones” in “11.11” and one baozi (steamed stuffed buns) representing the dot in between.
Many singles also choose to say goodbye to their single lives on the day. Many attend “blind date” parties and many people choose to marry on this day. In addition to meaning “single”, the four “ones” of the date can also mean “only one” as in “the only one for me”. Some p
eople will use this date an
d this meaning to tell their special someone that they are the only “one” in their heart.Which of the statement is TRUE according to the passage?
| A．Singles Day has a long history. |
| B．Only men celebrate Singles Day. |
C．Singles  Day is only celebrated in China. |
| D．Students in Nanjing University started Singles Day. |
People celebrate the festival mainly by .
| A．playing Mahjong | B．having dinner |
| C．getting married | D．hanging out with friends |
What is the best title of the passage?
| A．Singles Day |
| B．Four Single Men’s Singles Day |
| C．University Culture on Singles Day |
| D．Symbolic Food on Singles Day |
Which of the following best shows the structure of the passage?
(a-para.1 b-para.2 c-para.3 d-para.4 e-para.5 f-para.6)
| A． a | B． a | C． a | D． a |
b c d b c d f b d b c d e
e e c ef
f f
Long bus rides are like television shows. They have a beginning, a middle, and an end — with commercials thrown in every three or four minutes. The commercials are unavoidable. They happen whether you want them or not. Every couple of minutes a billboard glides by (滑过) outside the bus window. Only if you sleep, which is equal to turning the television set off, are you spared the unending cry of “You Need It! Buy It Now!”?
The beginning of the ride is comfortable and somewhat exciting, even if you’ve traveled that way before. Usually some things have changed — new houses, new buildings, someti
mes even a new road. The bus driver has a style of driving and it’s fun to try to figure it out the first hour or so. If the driver is particularly careless or daring, the ride can be as thrilling as a horror story. Will the driver pass the truck in time? Will the driver move into the right or the left-hand lane? After a while, of course, the excitement dies down. Sleeping for a while helps pass the middle hours of the ride. Food always makes bus rides more interesting, but you’ve got to be careful of what kind of food you eat. Too much salty food can make you very thirsty between stops.
The end of the ride is somewhat like the beginning. You know it will soon be over and there’s a kind of expectation and excitement in that. The seat, of course, has become harder as the hours have passed. By now you’ve sat with your legs crossed, with your hands in your lap, with your hands on the arm rests — even with your hands crossed behind your head. The end comes just at the right time. There just no more ways to sit.The long bus rides and TV shows are alike, because .
| A．they both can offer people with thrilling stories |
| B．they both are boring |
| C．they both have a beginning, a middle, and an end, with commercials in between |
| D．they both force people to sit for a long time |
During the whole bus ride, what come to the passengers’ eyes most frequently?
| A．Some salty food on the bus. | B．The programs on TV. |
| C．Advertisements on the road. | D．Trucks on the road. |
In order to pass the middle hours of the ride, you can .
| A．read the billboards | B．have something to eat |
| C．watch TV shows | D．sleep |
The purpose of the passage is to .
| A．show how much bus rides differ from TV shows |
| B．teach us how to deal with each period of a long bus ride |
| C．persuade readers to take a long bus ride |
| D．give the author’s opinion on long bus rides |
Fatimah Bamun dropped out of Balizenda Primary School in the first grade, when her father refused to buy her pencils and paper. Only after her teachers said to him that his daughter showed unusual promise(有希望) did he change his mind. Today, Fatimah, 14, tall and slender, studies math in a dirt-floored fourth-grade classroom.
Whether she will reach the fifth grade is another matter. Fatimah is facing the realities of a school with no toilet, no water, no hope of privacy (隐私) other than the shadow of a bush, and no girlfriends with whom to share feelings. Fatimah is the only girl of the 23 students in her class. In fact, in a school of 178 students, she is one of the only three girls who have made it past the third grade.
“I have no friend in the class,” she said. “Most of my friends have dropped out to get married. So during the break, I just sit in the classroom and read.”
Her father, however, now says he is fully behind her. “The people from the government are all the time telling us to send our daughters to school, and I am listening to these people,” he said.
But in many cases, parents don’t listen. Parents think that if the girls stay home, they can help with the harvesting, fetch the water and collect the firewood. So they take them out of school.
In a region where poverty, tradition and ignorance make about 24 million girls not even have an elementary school education. There are many other barriers (障碍) that prevent girls going to school, such as the lack of school toilets and water.
The issue is not only equality. The World Bank thinks that if women in sub-Saharan Africa had equal education, land and other wealth, the region’s economy could improve greatly. There is a connection between growth in Africa and sex equality. It is of great importance but still ignored by so many people. The author’s purpose in writing the passage is to _______.
| A．find the cause of Africa’s poverty |
| B．describe the poor education conditions of African girls |
| C．prove the inequality in African society |
| D．reform the present schooling systems in Africa |
Which of the following statements is NOT true according to the passage?
| A．Fatimah is a girl who shows signs of success for the future. |
| B．Fatimah’s father is now giving a lot of support to her. |
| C．Fatimah is the only girl who has made it past the fifth grade in her school. |
| D．Fatimah has no friends at school because they most of them have dropped out to get married. |
It can be inferred from the passage that _______.
| A．most African girls are treated equally in society |
| B．African governments don’t care whether girls go to school or not |
| C．most African girls would rather get married than go to school |
| D．African girls can’t enjoy equal chances for education |