Question

【题目】Scientists in Britain and the United States have made a new kind of enzyme(酵素) that eats plastics(塑 料). 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(发 现) 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 naturl 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(大量的). “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 poblem of pollution.

A. air B. water C. light D. plastic

【2】The underlined phrase “break down” in the passage probably means “ ” in Chinese.

A. 实验 B. 生产 C. 发明 D. 分解

【3】Researchers discovered that a natural enzyme helped eat plastics .

A. in B. in the US C. in Japan D. in China

【4】Which of the following is TRUE according to the passage?

A. The scientists are sill trying to improve the enzyme.

B. The enzyme will pollute large areas of land and water.

C. The natural enzyme woks better than the improved one.

D. The natural enzyme is harmful to humans and animals.

Answer 1

【答案】

【1】 D

【2】 D

【3】 C

【4】 A

【解析】

文章大意：本文主要介绍英国和美国的科学家们制造出了一种新的酵素，它可以吃掉塑料。在未来，它可以解决塑料污染的问题，这种酵素对人类和动物无害，对环境有很大帮助，但是这种技术还有很长的路要走。

【1】细节理解题。根据第一段的最后一句it could solve the problem of plastic pollution 它可以解决塑料污染问题。可知，该酵素可以解决塑料污染问题。故答案选D。

【2】词意猜测题。句意“这种酵素能_____PET，PET是一种塑料。”根据上一句it could solve the problem of plastic pollution 它可以解决塑料污染问题。可知，“break down”意思应该是“分解”。故答案选D。

【3】细节理解题。根据第三段中的句子The researchers made the discovery(发 现) while examining the structure of a natural enzyme in Japan. 研究人员在研究日本天然酵素结构时发现了这一现象。可知，应该是“日本”。故答案选C。

【4】推理判断题。根据最后一段中的句子“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. “我们会发现塑料污染可以用这种技术来阻止，但是，还有很长的路要走。” John McGeehan说。可知，科学家们仍在努力改进酵素。结合选项可知A选项正确，故答案选A。