Coffee is one of the most popular drinks throughout the world today. In fact, according to some estimates, over 30% of all adults in the world drink coffee at least once a day on the average. Coffee contains a kind of drug called caffeine. Caffeine is a chemical that stimulates (刺激) the nerves of the body. Drinking coffee tends to make people a little bit more awake―at least for a short time―because of this stimulating effect on the nervous system. A cup of coffee has, on the average, about 3% caffeine in it.
One story of the discovery of the coffee plant relates to this effect of caffeine. According to the story, coffee was discovered in East Africa. The story says that coffee was first found by a goat farmer named Kaldi. This was about the year 850. Kaldi was leading his animals through the mountains and the goats were stopping repeatedly to eat the plants near the path. Suddenly, some of the goats started jumping up and down in a very strange way. Kaldi figured out that the goats were acting this way because of the plants they were eating. Kaldi himself tried eating some of the green beans (豆荚) that the goats had been eating. He, too, felt the stimulating effect of the beans. Kaldi wanted to prove what had happened, so he picked some of the beans and took them back to the village, where he told his story.
The green bean got the name "Kaffa" and later "coffee" because the beans were discovered in a place called Kaffa in Africa. Then for years, people used to eat a few of the green Kaffa beans when they were in the mountains and needed extra energy to do their work. It was later found that the coffee beans could be picked and then dried until they turned brown, and then they could be stored. If the beans were dried and stored, they could be used at any time.What is the purpose of drinking coffee?
| A．To become more awake. | B．To become more healthy. |
| C．To become more happy. | D．To become more clever. |
How did the goats react after eating the plants?
| A．They fell asleep. |
| B．They could not find their way home. |
| C．They started jumping up and down. |
| D．They wanted to eat more. |
Why did the green bean get the name "Kaffa"?
| A．Because Kaldi loved his home village very much. |
| B．Because Kaldi's goats loved the green bean very much. |
| C．Because the beans were discovered in a place by this name. |
| D．Because the beans could be picked and dried. |
Medical drugs sometimes cause more damage than they cure. One solution to this problem is to put the drugs inside a capsule, protecting them from the body—and the body from them—until they can be released at just the right spot. There are lots of ways to trigger(引发) this release, including changing temperature, acidity, and so on. But triggers can come with their own risks—burns, for example. Now, researchers in California have designed what could be a harmless trigger to date: shining near-infrared light (NIR,近红外线) on the drug in the capsule.
The idea of using light to liberate the drug in the capsule isn't new. Researchers around the globe have developed polymers (聚合物) and other materials that begin to break down when they absorb either ultraviolet (UV,紫外线) or visible light. But tissues also readily absorb UV and visible light, which means the drug release can be triggered only near the skin, where the light can reach the capsule. NIR light largely passes through tissues, so researchers have tried to use it as a trigger. But few compounds(化合物) absorb NIR well and go through chemical changes.
That changed last year when Adah Almutairi, a chemist at the University of California, San Diego, reported that she and her colleagues had designed a polymer that breaks down when it absorbs NIR light. Their polymer used a commercially available NIR-absorbing group called o-nitrobenzyl (ONB). When they catch the light, ONB groups fall off the polymer, leading to its breakdown. But ONB is only a so-so NIR absorber, and it could be poisonous to cells when it separates from the polymer.
So Almutairi and her colleagues reported creating a new material for capsules that's even better. This one consists of a long chain of compounds called cresol groups linked in a polymer. Cresol contains reactive(易反应的) components that make it highly unstable in its polymeric form, a feature Almutairi and her colleagues use to their advantage. After polymerizing the cresols, they cap each reactive component with a light-absorbing compound called Bhc. When the Bhcs absorb NIR light, the reactive groups are exposed and break the long polymer into two short chains. Shining additional light continues this breakdown, potentially releasing any drugs in the capsule. What's more, Almutairi says, Bhc is 10 times better at absorbing NIR than is ONB and is not poisonous to cells.According to the passage, which of the following could be the best trigger?
| A．Temperature change. | B．NIR light. | C．Acidity change. | D．UV light. |
Why in ONB unsatisfactory?
| A． It breaks down when it absorbs NIR light. |
| B． It falls off the polymer and triggers drug release. |
| C． It has not come onto the market up till now. |
| D． It is not effective enough and could be poisonous. |
Which word can be used to complete the following process of changes?
| A．protected | B．formed | C．exposed | D．combined |
Honey(蜂蜜)from the African forest is not only a kind of natural sugar, it is also delicious. Most people, and many animals, like eating it. However, the only way for them to get that honey is to find a wild bees' nest(巢)and take the honey from it. Often, these nests are high up in trees, and it is difficult to find them. In parts of Africa, though, people and animals looking for honey have a strange and unexpected helper一a little bird called a honey guide.
The honey guide does not actually like honey, but it does like the wax (蜂蜡) in the beehives (蜂房). The little bird cannot reach this wax, which is deep inside the bees’ nest. So, when it finds a suitable nest, it looks for someone to help it. The honey guide gives a loud cry that attracts the attention of both passing animals and people. Once it has their attention, it flies through the forest, waiting from time to time for the curious animal or people as it leads them to the nest. When they
finally arrive at the nest, the follower reaches in to get at the delicious honey as the bird patiently waits and watches. Some of the honey, and the wax, always falls to the ground, and this is when the honey guide takes its share.
Scientists do not know why the honey guide likes eating the wax, but it is very determined in its efforts to get it. The birds seem to be able to smell wax from a long distance away. They will quickly arrive whenever a beekeeper is taking honey from his beehives, and will even enter churches when beeswax candles are being lit.Why is it difficult to find a wild bees' nest?
| A．It's small in size. | B．It's hidden in trees. |
| C．It's covered with wax. | D．It's hard to recognize. |
What do the words "the follower" in Paragraph 2 refer to?
| A．A bee. | B．A bird. | C．A honey seeker. | D．A beekeeper. |
The honey guide is special in the way________.
| A．it gets its food | B．it goes to church |
| C．it sings in the forest | D．it reaches into bees' nests |
What can be the best title for the text?
| A．Wild Bees | B．Wax and Honey |
| C．Beekeeping in Africa | D．Honey-Lover's Helper |
Three Boys and a Dad
Brad closed the door slowly as Sue left home to visit her mother. Expecting a whole day to relax, he was thinking whether to read the newspaper or watch his favourite TV talk show on his first day off in months. “This will be like a walk in the park,” he’d told his wife. “I’ll look after the kids, and you can go visit your mom.”
Things started well, but just after eight o’clock, his three little “good kids”—Mike, Randy, and Alex—came down the stairs in their night clothes and shouted “breakfast, daddy.” When food had not appeared within thirty seconds, Randy began using his spoon on Alex’s head as if it were a drum. Alex started to shout loudly in time to the beat（节拍）. Mike chanted “Where’s my toast, where’s my toast” in the background. Brad realized his newspaper would have to wait for a few seconds.
Life became worse after breakfast. Mike wore Randy’s underwear on his head. Randy locked himself in the bathroom, while Alex shouted again because he was going to wet his pants. Nobody could find clean socks, although they were before their very eyes. Someone named “Not Me” had spilled a whole glass of orange juice into the basket of clean clothes. Brad knew the talk show had already started.
By ten o’clock, things were out of control. Alex was wondering why the fish in the jar refused his bread and butter. Mike was trying to show off his talent by decorating the kitchen wall with his colour pencils. Randy, thankfully, appeared to be reading quietly in the family room，but closer examination showed that he was eating apple jam straight from the bottle with his hands. Brad Realized that the talk show was over and reading would be impossible.
At exactly 11:17, Brad called the daycare centre (日托所）.“I suddenly have to go into work and my wife’s away. Can I bring the boys over in a few minutes?” The answer was obviously “yes” because Brad was smiling.When his wife left home, Brad expected to ______ .
| A．go out for a walk in the park. |
| B．watch TV talk show with his children. |
| C．enjoy his first day off work. |
| D．read the newspaper to his children. |
Which of the following did Randy do?
| A．Drawing on the wall. | B．Eating apple jam. |
| C．Feeding the fish. | D．Reading in a room. |
Why did Brad ask the daycare centre for help?
| A．Because he wanted to clean up his house. |
| B．Because he suddenly had to go to his office. |
| C．Because he found it hard to manage his boys home. |
| D．Because he had to take his wife back. |
This text is developed______
| A．by space. | B．by comparison. | C．by process. | D．by time. |
Welcome to one of the largest collections of footwear in the world that will make you green with envy. Here at the Footwear Museum you can see exhibits from all over the world. You can find out about shoes worn by everyone from the Ancient Egyptians to pop stars.
| Room 1 The celebrity footwear section is probably the most popular in the entire museum. Started in the 1950s there is a wide variety of shoes and boots belonging to everyone from queens and presidents to pop stars and actors! Most visitors find the celebrities' choice of footwear extremely interesting. |
| Room 2 Most of our visitors are amazed—and shocked—by the collection of “special purpose” shoes on exhibition here at the Museum of Footwear. For example, there are Chinese shoes made of silk that were worn by women to tie their feet firmly to prevent them from growing too much！ |
| Room 3 As well as shoes and boots, the museum also exhibits shoeshaped objects. The variety is unbelievable. For example, there is a metal lamp that resembles a pair of shoes, and Greek wine bottles that look like legs！ |
| The Footwear Library People come from all over the world to study in our excellent footwear library. Designers and researchers come here to look up information on anything and everything related to the subject of footwear. |
Where would you find a famous singer's shoes?
| A．Room 1. | B．Room 2. | C．Room 3. | D．The Footwear Library. |
All exhibits each room ________.
| A．share the same theme |
| B．have the same shape |
| C．are made of the same material |
| D．belong to the same social class |
Which of the following is true according to the text?
| A．The oldest exhibits in Room 1 were made in the 1950s. |
| B．Room 2 is the most visited place in the museum. |
| C．Room 3 has a richer variety of exhibits than the other two. |
| D．Researchers come to the Footwear Library for data. |
The purpose of the text is to get more people to ________.
| A．do research | B．design shoes |
| C．visit the museum | D．follow celebrities |
There are some places in the world where great cities once stood. There were trees, gardens and grass. But now these cities have gone and the places are like deserts. Scientists began to study this land to find out what happened. Many of them believed the land died when the trees were cut down.
Trees help other plants grow and help hold the soil in place. They keep the soil from blowing away. The leaves of trees on the ground keep rainwater from running off. Trees near farms protect growing plants from strong winds.
Once there were hundreds of farms in the southwestern United States. Then the farms turned into fields of dry dust. Trees might have saved these farms. But few trees grow in the dry southwest now.
Now we try to save trees. In many places, when a tree is cut down , a new tree is planted in its place . We do not want the land to die.Places where great cities once stood are now like ______ .
| A．farms | B．gardens | C．deserts | D．fields |
What can trees do according to the passage ?
| A．Trees can keep other plants green |
| B．Trees can help other plants grow . |
| C．Trees can help the land grow . |
| D．Trees can keep other plants in place . |
Which is true ?
| A．Trees let the rainwater run off . |
| B．All the farms in the United States have turned into deserts . |
| C．There aren’t any trees in the dry southwest now . |
| D．Land will die if there are no trees . |
The main idea of this passage is _________ .
| A．that farms are better than cities |
| B．how farms turned into deserts |
| C．that trees are important to the land |
| D．how people save trees |
From the passage we know that _______ .
| A．trees can blow soil away |
| B．man should protect the land |
| C．trees grow only in deserts |
| D．trees die easily |