Ⅳ. Read the passage and fill in the blanks with proper words or the given words in their proper forms. 阅读下面短文，在空白处填入一个适当的单词或括号内单词的正确形式。
Did you have a favorite plastic toy when you were a child? Did it break? Did your parents throw it __1__? Well, I know where it is. It's floating (漂浮) in the Pacific Ocean. Well, let me explain how it got there.
Many __2__ (country) put their rubbish in the Pacific. Most of the rubbish sinks (下沉). But plastic floats and moves. The North Pacific Gyre (环流) pulls things towards the middle. So, all the plastic __3__ (end) up in the same place. One __4__ (science) says the area looks just like "plastic soup".
This "plastic soup" __5__ (discover) about ten years ago. Since that time the amount (数量) of plastic in this area has increased a lot. And this plastic will not just go away: it takes 400 years for plastic to degrade (分解)! And, even __6__ (bad), fish and sea birds are eating the plastic. They think it looks like food. The plastic doesn't kill __7__ (they) directly, but the fish (who are not smart!) think they are full. So, they stop __8__ (eat) and die of hunger. Dolphins and whales will also eat plastic and die.
Governments are starting to work together to clean up this area, __9__ it will take many years. That's why we should always try __10__ (recycle) plastic...even our old toys.

Ⅳ. 1. away 2. countries 3. ends 4. scientist 5. was discovered 6. worse 7. them 8. eating 9. but 10. to recycle

Ⅴ. Read the passage and choose the best answers.阅读短文，选择最佳答案。
Scientists in Britain and the United States have made a new kind of enzyme (酵素) 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 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 lare quantities (大量地). "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. According to the scientists, the enzyme may solve the problem of ______ pollution.
A. air
B. plastic
C. water
() 2. The underlined phrase "break down" in the passage probably means "______" in Chinese.
A. 实验
B. 生产
C. 分解
() 3. Researchers discovered that a natural enzyme helped eat plastics ______.
A. in Britain
B. in the US
C. in Japan
() 4. 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.

Ⅴ. 1. B 2. C 3. C 4. A