1. Of all the food in the world, many people think Chinese food is the ____________(taste).
2. We have finished eight ____________(nine) of the work, but the rest is really hard.
3. Dogs' hearing is much better than ____________(human), so they sometimes help us a lot.
4. The police warned people not to swim in the ____________ (pollute) river.
5. The teacher told us to pay attention to the word by____________ (circle) it.
6. One of the ____________ (劣势) is that you can't speak French.
7. According to traffic rules, all the ____________(乘客) need to fasten the safety belts.
8. Do you know that the seat is ____________(特地) designed for the elderly?
9. We are talking about the ____________(可能性) of winning the race if we try our best.
10. I saw a ____________ (陌生人) sitting at my desk, and I felt surprised.

1. tastiest 2. ninths 3. humans' 4. polluted 5. circling
6. disadvantages 7. passengers 8. specially 9. possibility 10. stranger

(　　　) 1. With the coming of the important exam, my parents have been in _______ that I should spend more time on my study rather than social activities.
A. treatment B. achievement C. development D. agreement

(　　　) 2. Labour plays an important role in developing students' view of the world and life. That's why we need to _______ labour education at school.
A. carry on B. carry out C. work on D. work out

(　　　) 3. Many teenagers' poor eyesight _______ their parents.
A. is worried about B. worries about C. is worrying about D. worries

(　　　) 4. Humans cannot survive on Mars _______.
A. unless there is no air and food B. if there is enough air and food C. without air or food D. if there is not air and food

(　　　) 5. Don't be angry with them. _______, they are still children.
A. After all B. In all C. At all D. Above all

(　　　) 6. — Our country will launch (发射) another Shenzhou spaceship soon. — _______. We will set up a new world record.
A. Take it easy B. It's not a big deal C. That's cool D. It's a shame

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Scientists in Britain and the United States have made a new kind of enzyme(酶) that eats plastics. With its help, plastics can be turned into smaller parts and go away quickly. Scientists believe that, in the future, it could solve the problem of plastic pollution.
The enzyme is able to break down PET, a form of plastic. PET was first made in the 1940s and is now widely used to make plastic bottles. It can remain in the environment for many years and pollute large areas of land and water. So it has always been a headache to deal with the waste from PET and other plastics.
The researchers made the discovery while examining the structure(结构) of a natural enzyme in Japan. They found that the natural enzyme was helping to break down PET plastics. So, they decided to make small changes to the enzyme by adding some amino acids(氨基酸). It made the natural enzyme's plastic-eating abilities work faster and better.
John McGeehan, one of the lead researchers, said, “We've made an improved enzyme. It's better than the natural one. And we are trying to make more improvements to it.” He went on, “The enzyme is not harmful to humans or animals, and it is friendly to the environment. So we are considering putting it into wider use.”
The team is now trying to make the enzyme break down PET in large quantities(数量). “We'll see that the plastic pollution may be stopped with this technology. However, there is still a long way to go,” John McGeehan added.

(　　　) 1. The underlined phrase “break down” probably means “_______” in Chinese.
A. 实验 B. 生产 C. 发明 D. 分解

(　　　) 2. Researchers discovered that a natural enzyme helped eat plastics _______.
A. in Britain B. in the US C. in Japan D. in China

(　　　) 3. Which of the following is TRUE according to the passage?
A. The scientists are still trying to improve the enzyme. B. The enzyme will pollute large areas of land and water. C. The natural enzyme works better than the improved one. D. The natural enzyme is harmful to humans and animals.

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