题目内容

【题目】读下面材料,同答问题。

根据体质人类大体可以分为白种人、黄种人和黑种人。同一人种在世界上有大范围的集中分布区,也有小范围的零星分布。

黑色人种主要分布在热带地区,白种人多分布在较为寒冷的地区,黄种人多分布在温带。

(1)白、黄、黑三个人种主要划分的依据是____

(2)一位外国小朋友,皮肤黝黑,头发乌黑卷曲,脸庞平,嘴唇厚。他可能是____种人。材料提到这个人种主要分布在____地区。

(3)中国人属于____人种,非洲北部、亚洲两部主要分布着____人种。

【答案】体质 热带 黄色 白色

【解析】

根据世界上三大人种的分布及特点,进行分析解答。

1)白、黄、黑三大人种主要划分的依据是体质特征的差异。

2)分析可知,一位外国小朋友,皮肤黝黑,头发乌黑卷曲,脸庞平,嘴唇厚。他可能是黑种人。材料提到这个人种主要分布在撒哈拉以南的非洲热带地区。

3)中国人属于黄人种,非洲北部、亚洲两部主要分布着白人种。

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【题目】 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 plasticeating 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(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完成句子:

With the help of this new enzyme, plastics can be________________ smaller parts and go away quickly.

2完成句子:

PET can pollute large areas of ________________.

3简略回答问题: What did the researchers find according to the passage?

____________________________________________

4找出并写下文章的主题句:

____________________________________________

5将文中画线句子译成汉语:

____________________________________________

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