科学家研制出人造蜘蛛丝
科学家研制出人造蜘蛛丝

Researchers know one of nature's big secrets. They found out how spiders make strong silk. It is stronger than steel. They found that there is a special acid(酸) in the place where the spider keeps its silk. This makes the silk strong. The researchers copied(复制) this. They made enough spider silk to stretch for one kilometer.
The new silk could be very useful. Doctors think it can help with stitches, burns and ligament damage. Airplane companies and clothes companies want it. A researcher said, "This is the first successful example of copying spider silk. This production of silk is a kind of bio-material."    

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1.What did researchers find out?

A They found out how spiders make strong silk.

B They found out how spiders make weak silk.

C They found out how spiders make clean silk.

D They found out how spiders make beautiful silk.

解析：选A。细节理解题。根据第一段第二句They found out how spiders make strong silk.可知，故选A。

2.How long did the man-made spider silk stretch?

A One kilometer.

B Two kilometers.

C Three kilometers.

D Four kilometers.

解析：选A。细节理解题。根据第一段最后一句They made enough spider silk to stretch for one kilometer.可知，故选A。

3.Which companies will need the spider silk most?

A Airplane companies.

B Clothes companies.

C Toy companies.

D Both A and B.

解析：选D。细节理解题。根据第二段第三句Airplane companies and clothes companies want it.可知，故选D。

4.What does the passage mainly talk about?

A Nature's big secrets.

B Airplane and clothes companies.

C Man-made spider silk.

D A special acid.

解析：选C。主旨大意题。这篇文章主要讲述了科学家们研制出的人造蜘蛛丝，故选C。