Vending machines （投币式自动售货机） are found in 16% of U．S．elementary schools, 52% of middle schools and 88% of high schools．About 22% of students in grades 1 through 12 buy food in vending machines each day—and those purchases added an average of 253 calories to their diets, according to a new study in the September issue of the Journal of School Health．
Just to be clear, those were not 253 calories' worth of tofu, yogurt or carrot．The most popular vending machine items included soft drinks, candy, chips, crackers, cookies, cakes and ice cream．On the plus side （好的方面）, kids also bought low-fat milk, fruit juice and even fruit, the study found．
But the eventual effect on kids' diets was not good．Those who bought from vending machines ate an average of 156 grams of sugar per day, compared with 146 grams for those who abstained （节制）．They also consumed less fiber, iron and vitamin B．
One silver lining: Vending machine customers ate 4% less sodium （钠） than other students--an average of 3,287 milligrams per day compared with 3,436 mg for those who didn't buy from vending machines．That's probably because the extra snacks made kids too full to eat as much at mealtimes, when dishes are especially Salty．In any event, kids should eat no more than 1,200 to 1,500 mg of sodium each day, according to the Mayo Clinic．Even for adults, the government recommends a daily limit of 2,300 mg．
Overall, vending machines in school appear to be a threat to children's health．The researchers calculated that all that snacking adds up to about14 extra pounds per child per school year．For some students this might be a serious contributor to weight issues．The study was based on data collected from 2,309 children nationwide for the third School Nutrition Dietary Assessment Study, which was
conducted by the U．S．Department of Agriculture's Food and Nutrition Service．The students using vending machines take in less of all the following EXCEPT ．
| A．sugar | B．fiber | C．vitamin | D．iron |
The underlined words “One silver lining” mean “ ”．
| A．a discouraging condition at present |
| B．a bright side of a difficult situation |
| C．an urgent warning from health experts |
| D．an increasing concern from the public |
Why do kids buying food from vending machines take less salt probably?
| A．They prefer less salty food． |
| B．They have formed healthy eating habits． |
| C．They eat less food at mealtimes． |
| D．They take less junk food as snacks． |
What's the purpose of the text?
| A．To teach children a balanced diet． |
| B．To introduce the finding of a new study． |
| C．To remind parents of children's health． |
| D．To tell the history of vending machines． |
You may not pay much attention to your daily elevator ride. Many of us use a lift several times during the day without really thinking about it. But Lee Gray, PhD, of the University of North Carolina, US, has made it his business to examine this overlooked form of public transport. He is known as the “Elevator Guy”.
“The lift becomes this interesting social space where etiquette（礼仪）is sort of strange,” Gray told the BBC. “They are socially very interesting but often very awkward places.”
We walk in and usually turn around to face the door. If someone else comes in, we may have to move. And here, according to Gray, liftusers unthinkingly go through a set pattern of movements. He told the BBC what he had observed.
He explained that when you are the only one inside a lift, you can do whatever you want – it’s your own little box.
If there are two of you, you go into different corners, standing diagonally（对角线地）across from each other to create distance.
When a third person enters, you will unconsciously form a triangle. And when there is a fourth person it becomes a square, with someone in every corner. A fifth person is probably going to have to stand in the middle.
New entrants to the lift will need to size up the situation when the doors slide open and then act decisively. Once in, for most people the rule is simple – look down, or look at your phone.
Why are we so awkward in lifts?
“You don’t have enough space,” Professor Babette Renneberg, a clinical psychologist at the Free University of Berlin, told the BBC. “Usually when we meet other people we have about an arm’s length of distance between us. And that’s not possible in most elevators.”
In such a small, enclosed space it becomes very important to act in a way that cannot be construed（理解）as threatening or strange. “The easiest way to do this is to avoid eye contact,” she said.The main purpose of the article is to _______.
A. share an interesting but awkward elevator ride
B. tell us some unwritten rules of elevator etiquette
C. analyze what makes people feel awkward in an elevator
B. remind us not to behave strangely when in an elevator According to Gray, when people enter an elevator, they usually _______.
| A．turn around and greet one another |
| B．look around or examine their phone |
| C．try to keep a distance from other people |
| D．make eye contact with those in the elevator |
Which of the following describes how people usually stand when they are in the elevator?
The underlined phrase “size up” in Paragraph 7 is closest in meaning to _______.
| A．judge | B．ignore |
| C．put up with | D．make the best of |
Hercule Poirot looked over the small gate which gave admission to Pine Crest. It was a modern nicely-built house. It was on a hill top, and the hill top was planted with a few sparse pines. It had a small neat garden and a large elderly man was watering with a big tin.
Spence’s hair was now grey all over. He had not shrunk much in girth（围长）, though. He stopped watering and looked at the visitor at the gate. Hercule Poirot stood there without moving.
“God bless my soul,” said Spence. “It must be. It can’t be but it is. Yes, it must be Hercule Poirot!”
“Aha,” said Poirot, “you remember me. I’m grateful.”
Spence abandoned the watering can and came down to the gate.
“What brings you down here?”
“What has brought me to many places in my time,” said Poirot, “and what once a good many years ago brought you to see me. Murder, Spence.”
“I’m done with murder since I retired,” said Spence, “except in the case of weeds. Killing weeds is never easy as you think, something’s always wrong. How did you know where to find me?” he asked as he opened the gate and Poirot passed through.
“You sent me a Christmas card. It had your new address on it.”
“Ah yes, so I did. I’m old-fashioned, you know, I like to send round cards at Christmas time to a few old friends. I’m an old man now.”
“We both are.”
“Not much grey in your hair,” said Spence.
“I take care of my hair with a bottle,” said Poirot. “There is no need to appear in public with grey hair unless you wish to do so. By the way, why have you come to live in Woodleigh Common?”
“As a matter of fact, I came here to join forces with a sister of mine. She lost her husband, her children are married and living abroad. So I moved in here. Pensions（退休金）don’t go far nowadays, but we do comfortably living together.”From their dialogue, we can learn about _______.
| A．their common friends | B．Spence’s sister’s characters |
| C．their relationship | D．Poirot’s recent life |
Which statement is TRUE according to the passage?
| A．Spence used to deal with murder. |
| B．Poirot didn’t care about his appearance. |
| C．Spence moved to join his sister for lack of money. |
| D．Poirot came specially to reunite with his old friend. |
From the passage we can infer that they might _______ next.
| A．meet Spence’s family | B．discuss about a murder |
| C．visit Spence’s new home | D．water the garden together |
Space is where our future is — trips to the Moon, Mars and beyond. Most people would think that aside from comets(彗星) and stars, there is little else out there. But, since our space journey started we have left so much trash（垃圾） there that scientists are now concerned that if we don't clean it up, we may all be in mortal （致命的）danger.
The first piece of space junk was created in 1964, when the American satellite Vanguard I stopped operating and lost its connection with the ground center. However, since it kept orbiting around the Earth without any consequences, scientists became increasingly comfortable abandoning（抛弃） things that no longer served any useful purpose in space.
It is estimated （估计）that there are now over 500,000 pieces of man-made trash orbiting the Earth at speeds of up to 17,500 miles per hour. The junk varies from tiny pieces of paint chipped off rockets to cameras, huge fuel tanks, and even odd items like the million-dollar tool kit that astronaut Heidemarie Stefanyshyn Piper lost during a spacewalk.
The major problem with the space trash is that it may hit working satellites and damage traveling spacecraft(飞船). Moreover, pieces of junk may collide（碰撞） with each other and break into pieces which fall back to the Earth. To avoid this, scientists have invented several ways for clearing the sky. Ground stations have been built to monitor larger pieces of space trash to prevent them from crashing into working satellites or space shuttles. Future plans include a cooperative effort among many nations to stop littering in space and to clean up the trash already there.What was the first piece of man-made space trash?
| A．A camera. | B．A tool kit. |
| C．A fuel tank. | D．A broken satellite. |
Why were scientists NOT concerned about space trash in the beginning?
| A．It no longer served any useful purpose. |
| B．It was millions of miles away from the Earth. |
| C．It did not cause any problems. |
| D．It was regarded as similar to comets and stars. |
Which of the following statements is true about space junk?
| A．It is huge, heavy machines. |
| B．It never changes position. |
| C．It floats slowly around the Earth. |
| D．It may cause problems for space shuttles. |
What has been done about the space trash problem?
A, Scientists have cleaned up most of the trash.
B. Large pieces of space trash are being closely watched.
C. Many nations have worked together to stop polluting space.
D. Ground stations are built to help store the trash properly in space.
One reaction to all the concern about tropical deforestation（毁林） is a blank stare that asks the question, "Since I don't live there, what does it have to do with me?"
The answer is that your way of life, wherever you live in the world, is tied to the tropics in many ways. If you live in a house, wash your hair, eat fruits and vegetables, drink soda, or drive a car, you can be certain that you are affected by the loss of tropical forests.
Biologically, we are losing the richest regions on earth when, each minute, a piece of tropical forest, the size of ten city blocks, disappears. As many as five million species of plants, animals, and insects (40 to 50 percent of all living things) live there, and are being lost faster than they can be found and described. Their loss is immeasurable.
Take rubber for example. For many uses, only natural rubber from trees will do. Synthetics are not good enough. Today over half the world's commercial rubber is produced in Malaysia and Indonesia, while the Amazon's rubber industry produces much of the world's four million tons. And rubber is an important material in making gloves, balloons, footwear and many sporting goods. Thousands of other tropical plants are valuable for their industrial use.
Many scientists strongly believe that deforestation contributes to the greenhouse effect -- or heating of the earth from increased carbon dioxide in the atmosphere. As we destroy forests, we lose their ability to change carbon dioxide into oxygen.
Carbon dioxide levels could double within the next half-century, warming the earth by as much as 4.5 degrees. The result? A partial melt-down of polar ice caps, raising sea levels as much as 24 feet; even 15 feet could threaten anyone living within 35 miles of the coast. Unbelievable? Maybe. But scientists warn that by the time we realise the severe effects of tropical deforestation, it will be 20 years too late.
Can tropical deforestation affect our everyday lives? Now, you should have got the answer.The underlined word "synthetics" probably means_________.
| A．natural rubber | B．tropical materials |
| C．man-made material | D．commercial rubber |
According to the passage, which of the following is NOT true?
| A．The forests are losing their function in turning carbon dioxide into oxygen. |
| B．Many of our daily uses are related to the tropical forests. |
| C．Tropical plants can be used to make industrial products. |
| D．High carbon dioxide levels will make the earth warmer. |
The author's attitude towards the tropical deforestation is _________ .
| A．puzzling | B．cold |
| C．supporting | D．opposed |
Which of the following might be the best title for the passage?
| A．Tropical Forests | B．The Value of Tropical Forests |
| C．Tropical Forests and Our Life | D．The Greenhouse Effects |
How cool can libraries be in an era（时代）of iPods and Kindles? More than you think．Only if you know where to go．
Central Library: Seattle, Washington, United States
The Central Library in Seattle is modern and fashionable and has tourists from around the world paying visits and taking tours．It was designed by Dutch architect Rem Koolhaas and American designer Joshua Ramus．Tours began in 2006, two years after its opening．The library holds various art exhibitions, book signings and other events, while visitors can stop by the Chocolate cart for a coffee and scan through the gift shop anytime
Trinity College Library: Dublin, Ireland
The Trinity College Library in Dublin is the oldest library in Ireland, founded in 1592 by Queen Elizabeth I．It is the largest single library in the world, also known as the Long Room, which contains more than 200,000 0fthe library's oldest books．The Long Room houses one of the oldest harps（竖琴） in Ireland．Dating to the 15th century, the old harp is the model for the symbol foreland．
Geisel Library, University of California: San Diego, United States
At first glance, it looks like a spaceship．Architect William Pereira, who helped design actual space launch facilities at Cape Canaveral in Houston, Texas, designed the library in 1970．It has been featured in sci-fi films, short stories and novels．The library hosts "Dinner in the Library," which invites readers for cocktails, and also a special speech from distinguished authors．
TU Delft Library: The Netherlands
The library at the Delft University of Technology was constructed in 1997 and has more than 862,000 books, 16,000 magazine subscriptions and its own museum．The building itself exists beneath the ground, so you can't really see the actual Library．What makes it interesting is the roof, which is a grassy hill．The roof covers 5,500 square meters．And it has become one of the most striking and greenest structures in the area．Which of the four libraries has the longest history?
| A．Central Library． |
| B．Geisel Library． |
| C．Trinity College Library． |
| D．TU Delft Library． |
What makes Geisel Library different from the others is that
| A．famous writers often deliver speeches there |
| B．it has a reoffer grassy hill |
| C．Queen Elizabeth I founded the library |
| D．it is the largest single library in the world |
In Central Library, you can
| A．buy souvenirs | B．enjoy sci-fi films |
| C．drink cocktails | D．see the old harp |