Scientists from England’s Newcastle University have discovered that bacteria have the ability to detect smells, according to a study by the university on Sunday.
The team of scientists, led by Dr. Reindert Nijland, discovered that bacteria can detect certain types of smell- producing chemicals, including ammonia (氨) that is produced by other bacteria. Once they sense the smells from other kinds of bacteria, the bacteria will gather together to form a colony (集群) and form a layer of slime (粘液) in order to force the competitors out of their area. The response decreases as the distance between the two bacterial colonies increases.
That slime, also known as biofilm, is one of the primary causes of infection on many medical implants(移植物). Biofilms also slow down ships and are believed to cost the marine industry millions of dollars annually. However, they can also be used to clean up spilled oil floating on the sea, as they grow strong on it.
“This is the first evidence of a bacterial ‘nose’able to detect potential competitors,” Dr. Nijland said in the August 15 statement, which confirms that bacteria possess qualities similar to four of the five senses that humans enjoy (sight, hearing, touch, taste, and smell), the others being touch, taste, and sight.
“The fact that bacteria formed slime when exposed to ammonia has important significance for understanding how biofilms are formed and how we might be able to use them to our advantage,” he added.
Their findings were published in Sunday’s edition of biotechnology journal, and could change the way scientists look at how each of the senses developed over time.
“It was thought for a long time that smell existed only in complex living creatures,” Dr. Nijland said. “Now we see that bacteria are able to do the same, so the indication is that the ability may have developed even earlier.”We learn from the text that biofilms _____.
| A．may cause oil to spill |
| B．can be used to benefit humans |
| C．are the major causes of infection |
| D．are more likely to be found on ships |
Which of the following describes bacteria correctly?
| A．They can talk. |
| B．They cannot see |
| C．They cannot hear. |
| D．They can imitate others. |
The findings may help scientists know more about ______.
| A．how bacteria reproduce |
| B．the development of the senses. |
| C．how to control bacterial infection. |
| D．the complex relation of living creatures |
Which of the following would be the best title for the text?
| A．Bacteria can produce ammonia |
| B．Bacteria have a sense of smell |
| C．Why are biofilms so annoying? |
| D．How do bacteria communicate? |
A
You've probably heard about sports coaches, fitness coaches, voice and music teachers, career counselors, psychiatrists(精神病医师) and other specialists who teach skills and help us cope with daily life.
But there's a rapidly growing kind of professional who does a little bit of everything. She or he is called a “ life coach ”. People who are at crossroads in their lives, and corporations that want to give certain employees a career boost, are turning to them for help.
The idea that one person’s success story can change other people’s lives for the better goes back at least to the 1930s. Dale Carnegie’s famous self-improvement program “How to Win Friends and Influence People” came along soon thereafter.
But this new style of life coaches includes more than enthusiastic speakers or writers. They use their own experiences in business, sports, military service, or psychotherapy (心理疗法)to help others make critical life decisions.
They often give their approach a slogan, such as “energy coaching” or “fearless living” or “working yourself happy”.
Dave Lakhani in Boise, Idaho, for instance, works with salespeople to develop what he calls a “road map”. He says an ongoing relationship with a coach is like having a personal fitness trainer for one’s career and life outside work.
Lakhani’s Bold Approach coaching firm also donates some of its time to help people who are anything but successful---including battered women and struggling single mothers.
But others in the so-called “helping professions” are not thrilled about the life-coaching movement. They say that anyone, trained or untrained, can call himself or herself a life coach, and that slick(华而不实的) promoters who mess with people’s lives can do more harm than good.Which of the following is the best title for the passage?
| A．Working Yourself Happy. |
| B．Life Coaches Help with Tough Decisions. |
| C．How to Cope with Daily Life with Life Coaches. |
| D．The Life-Coaching Movement. |
The underlined phrase “life coach” in Paragraph 2 means“_______”.
| A．The career counselor who teaches skills |
| B．The psychiatrist who helps us cope with daily life |
| C．The fitness coach who teaches us lessons |
| D．The specialist who helps us make important life decisions |
The last paragraph is mainly about__________.
| A．the introductions of life coach |
| B．the disagreements of life coach |
| C．the effects of life coach |
| D．the experiences of life coach |
What is the author’s attitude towards life coaches?
| A．Cautious． | B．Approving． |
| C．Casual． | D．Disapproving． |
C
Dreams can be familiar and strange, fantastical or boring, but some dreams might be connected to the mental processes that help us learn. No one knows for certain why people dream, but some dreams might be connected to the mental processes that help us learn. In a recent study, scientists found a connection between nap-time(打盹时的) dreams and better memory in people who were learning a new skill.
In the study, 99 college students between the ages of 18 and 30 each spent an hour on a computer, trying to get through a virtual maze (迷宫). The maze was difficult, and the study participants had to start in a different place each time they tried --- making it even more difficult. They were also told to find a particular picture of a tree and remember where it was.
For the first 90 minutes of a five-hour break, half of the participants stayed awake and half were told to take a short nap. Participants who stayed awake were asked to describe their thoughts. Participants who took a nap were asked about their dream after sleep---and they were awakened within a minute of sleep to describe their dreams.
Stickgold, a neuroscientist (神经科学家), wanted to know what people were dreaming about when their eyes weren’t moving, during sleep.
Four of the 50 people who slept said their dreams were connected to the maze. Some dreamed about the music that had been playing when they were working; others said they dreamed about seeing people in the maze. When these four people tried the computer maze again, they were able to find the tree faster than before their naps.
Stickgold suggests the dream itself doesn’t help a person learn --- it’s the other way around. He suspects that the dream was caused by the brain processed associated with learning.
All four of the people who dreamed about the task had done poorly the first time, which makes Stickgold wonder if the dreams show up when a person finds a new task particularly difficult. People who had other dreams, or people who didn’t take a nap, didn’t show the same improvement.Before having a short nap, participants of the experiment were asked to ___________.
| A．stay in different place in the maze |
| B．design a virtual maze which is difficult to get through |
| C．experience the experiment and try to remember something |
| D．get through a virtual maze on a computer from the same place |
After doing what they were asked on computers, participants ___________.
| A．were divided into two groups to do different things at break |
| B．were so tired as to fall asleep |
| C．felt bored with the experiment and they were sleepy |
| D．were asked to remember their experiment separately |
What can we learn from the passage?
| A．Participants who took a nap were required to express their thought. |
| B．Some dreams may encourage people to invent something new. |
| C．Participants who dreamed about films could finish the task more easily. |
| D．Participants whose dreams had something to do with the maze could find the tree faster. |
According to Stickgold, ____________.
| A．every person may dream about what they learned |
| B．people’s brain processes may still be connected with their learning in their dreams |
| C．once people’s eyes stop moving, they are sued to dream about something |
| D．no matter fantastical or boring, dreams are connected with peoples life |
Which of the following can be the best title for this passage?
| A．Strange Dreams |
| B．Stickgold, a Dream Expert |
| C．Dreaming Makes Better |
| D．Not All Dreams Are True |
B
Chemical Safety
Procedures for handling chemical spills(泄露) and leaks.
Chemical spills and leaks can be broken down into two basic types: simple spills, which you can clean up yourself and complicated spills, which require outside assistance.
If your spill meets ANY of the following conditions, it is a COMPLICATED SPILL.
A person is injured; or
The identity of the chemical is unknown; or
Multiple chemicals are involved; or
The chemical is highly poisonous, flammable (可燃的) or reactive ; or
The spill/leak occurs in a “public space” such as a corridor; or
The spill/leak has the potential to spread to other parts of the building such as through the ventilation (通风) system; or
The clean up procedures are not known or appropriate materials are not readily available; or
The clean up requires a respirator (呼吸器) (including cartridge respirators) to be worn and no personnel have been trained and fit-tested in accordance(一致) with the campus Respiratory Protection Program; or
The spill/leak may endanger the environment by reaching waterways or outside ground, or by going down a drain
If none of the above conditions are met, the spill is defined as a simple spill. You may clean up simple spills in accordance with Chapter 6 of the Chemical Safety Guide. For consultative assistance, call Division of Research Safety (DSR) at 333-2755.
| How to report a complicated spill 1. Evacuate(撤退) to a safe location, and alert others to evacuate. 2. Dial 9-911 from a campus phone. 3. Tell the operator you are calling to report a chemical spill at the University of Illinois. 4. Have the following information ready. Name of chemical Quantity spilled Location of spill (Full building name and room number) Number of people injured or slashed If applicable, the occurrence of a fire or explosion Your name and phone number 5. Have someone knowledgeable about the chemical spilled meet the fire department at the main entrance to your building. Take a Material Safety Data Sheet (MSDS) of the chemical, if it is readily available. |
Which of the following situation can be classified as a simple spill?
| A．Some spilled liquid causes a fire in the building. |
| B．Yellow and green gases are leaking from the storage room. |
| C．An unknown red chemical is found on the corridor floor. |
| D．A researcher spills his milk all over the lab floor. |
According to the safety instructions, upon discovering a complicated spill on campus, people should _________.
| A．put on a respirator as soon as possible |
| B．refer to Chapter 6 of the Chemical Safety Guide |
| C．get away from the spill and report it to authorities |
| D．call Division of the Research Safety at 333-2755 |
“MSDS” in the passage possibly refers to _____.
| A．a mask |
| B．an explanation about the chemical |
| C．a device |
| D．another kind of chemical |
Who are most possibly the targeted audiences of this article?
| A．Students in the Chemistry Department of a university. |
| B．Researchers working at Chemical Institution of Illinois. |
| C．Members of Division of Research Safety. |
| D．Staff members at a chemical manufacturing company. |
The purpose of the material above is to ____________ .
| A．inform people of the dangers of various chemical spills |
| B．introduce complicated spills and necessary measures in response to them |
| C．encourage students to join the campus Respiratory Protection Program |
| D．compare simple spills and complicated spills |
A
Thanks to a young waiter, I only recently discovered that a friend of 20 years was once a yo-yo virtuoso(溜溜球大师).
“Oh， stop it!” Jackie said when I started laughing during our dinner. “I was, too. And I knew how to ‘Walk the Dog.’ ”
“Wow, really?” said our waiter, Jumario Simmons, flashing a big smile at us.
“Don’t encourage her,” I said.
“What else could you do?” he asked.
“I did ‘Round the World,’” Jackie said, now ignoring me completely. “That cradle(婴儿时期的) thing, too.”
I’d asked Jumario what he did when he wasn’t waiting on tables. The 24-year-old waiter was so smart that I knew there had to be more to his story. It turns out that he won a regional yo-yo competition last year. He also gives free lessons to kids. “It gives them something to do,” Jumario said. “Keeps them off the streets.”
One of the great things about eating out is the table talk with strangers, which reminds us that everyone has a life and a name. But the other day I heard that some restaurants are ending this talk between diners and servers. I listened to the reporter describe how their improvements are allowing customers to text orders from their tables to speed up service.
The reporter got my attention with this sentence: “Five minutes after typing ‘I’m at table 3’, a meal arrives at the table.” But there wasn’t a “please” with this order, which should have been a request, by the way. If you’ve ever waited on tables, you know that the last thing you need is yet another way for a customer to be unpleasant.
Most servers are constantly mediating(调解) between customers’ requests for substitutions and overworked cooks’ accusations of treason. Except at high-end restaurants, servers also have to hover like mothers of preschoolers so that we might consider them worthy of a large enough tip to lift their pay to minimum wage.
Texting a server from a table a few feet away is equal to moving our fingers and shouting, “Hey, you!” It was rude in 1957, and it’s rude now. You won’t ever find me texting a waiter or waitress.What do we know from the text?
| A．The waiter knows Jackie well. |
| B．The waiter is good at playing yo-yo. . |
| C．Jackie plays yo-yo in her spare time. |
| D．The author has a great interest in playing yo-yo. |
Some restaurants allow diners to text a server from a table to .
| A．improve their service |
| B．reduce the cost of service |
| C．show respect for diners |
| D．stop talks between diners and servers |
What’s the last but one paragraph mainly about?
| A．The pay of servers |
| B．The work of servers. |
| C．The customers’ request. |
| D．The work of mothers of preschoolers. |
From the passage, the author’s attitude towards texting a server from a table is _________.
| A．indifferent | B．negative |
| C．curious | D．positive |
The passage mainly focuses on .
| A．how to wait on tables |
| B．the friendship between old friends |
| C．where to eat out |
| D．the relationship between customers and waiters |
A lot of people are afraid spiders（蜘蛛）–even the small ones. But a big tarantula（鸟蛛）is much more terrifying for many. Now, scientists in Sri Lanka have discovered a huge species of tarantula that’s about the size of a person’s face.
The first part of the spider’s scientific name, Poecilotheria rajaei, comes from the Greek words for “spotted”(poikilos) and “wild beast” (therion). Its species name, rajaei, comes from a local police officer who helped the team that discovered the creature. Poecilotheria rajaei has 8-inch long legs, and unusual spots colored gray, pink, and yellow.
Although it is very big, is there a real reason to be afraid of one? Maybe. This tarantula has enough poisonous fluid（毒液）to kill mice and small birds and snakes –but its bite wouldn’t cause the death of most humans.
Poecilotheria rajaei was first seen in 2009, when a villager in Sri Lanka found the body of a male and brought it to Ranil Nanayakkara, co-founder of Sri Lanka’s Biodiversity Education and Research organization.
An examination of the awesome creature proved that it was a type of tarantula scientists hadn’t seen before. So Nanayakkara carefully looked through the Sri Lankan forests to try to find more of the spiders.
It’s still too early to know whether this species is endangered. But researchers fear that the tarantulas’ natural habitat is slowly being destroyed.
“ They prefer old trees, but due to the widespread removal of trees the number has dropped,” Nanayakkara said in an interview.
Tarantulas have eight legs and two body parts. They are different from insects, which have only six legs but three body parts. Tarantulas have hairy bodies and are usually larger than other types of spiders. Some species of tarantulas can live up to 25 years.
While Poecilotheria rajaei is very big, the largest tarantula is the Goliath bird-eater (Theraphosa blondi). Found in the rainforests of South America, its legs can be up to 10 inches long. But don’t worry if you ever see one: Its poisonous fluid isn’t really dangerous to humans.According to the text, Poecilotheria rajaei _______.
| A．has unique spots |
| B．is mostly yellow |
| C．has 10-inch long legs |
| D．was first seen by the Greeks |
Which of the following is most likely to survive a bite from Poecilotheria rajaei?
| A．A little girl |
| B．A small bird. |
| C．A big mouse |
| D．A small snake. |
The number of Poecilotheria rajaei has dropped because___________.
| A．the global climate has changed |
| B．they have too many natural enemies |
| C．some people are killing them illegally |
| D．more and more forests are disappearing |
Which of the following is TRUE about tarantulas?
| A．They are a kind of insect. |
| B．Most of them live in South America. |
| C．Their body is divided into three parts. |
| D．They are usually of bigger size than other spiders. |
Which section of a newspaper is the text most probably taken from?
| A．Life | B．Nature |
| C．Science | D．Business |