【題目】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(發(fā) 現(xiàn)) 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. 實(shí)驗(yàn) B. 生產(chǎn) C. 發(fā)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.

【答案】

【1】 D

【2】 D

【3】 C

【4】 A

【解析】

文章大意：本文主要介紹英國(guó)和美國(guó)的科學(xué)家們制造出了一種新的酵素，它可以吃掉塑料。在未來(lái)，它可以解決塑料污染的問(wèn)題，這種酵素對(duì)人類(lèi)和動(dòng)物無(wú)害，對(duì)環(huán)境有很大幫助，但是這種技術(shù)還有很長(zhǎng)的路要走。

【1】細(xì)節(jié)理解題。根據(jù)第一段的最后一句it could solve the problem of plastic pollution 它可以解決塑料污染問(wèn)題。可知，該酵素可以解決塑料污染問(wèn)題。故答案選D。

【2】詞意猜測(cè)題。句意“這種酵素能_____PET，PET是一種塑料。”根據(jù)上一句it could solve the problem of plastic pollution 它可以解決塑料污染問(wèn)題。可知，“break down”意思應(yīng)該是“分解”。故答案選D。

【3】細(xì)節(jié)理解題。根據(jù)第三段中的句子The researchers made the discovery(發(fā) 現(xiàn)) while examining the structure of a natural enzyme in Japan. 研究人員在研究日本天然酵素結(jié)構(gòu)時(shí)發(fā)現(xiàn)了這一現(xiàn)象�？芍�，應(yīng)該是“日本”。故答案選C。

【4】推理判斷題。根據(jù)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. “我們會(huì)發(fā)現(xiàn)塑料污染可以用這種技術(shù)來(lái)阻止，但是，還有很長(zhǎng)的路要走。” John McGeehan說(shuō)。可知，科學(xué)家們?nèi)栽谂Ω倪M(jìn)酵素。結(jié)合選項(xiàng)可知A選項(xiàng)正確，故答案選A。

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