题目内容
阅读下列短文, 从所给的四个选项中, 选出最佳答案。
Spider silk is very strong. It can be stretched to 13% of its normal length without breaking. It resists water and it is not affected by extreme temperature changes. Spider silk also does not react to chemicals. It is so thin that one piece of spider silk long enough to reach around the world would weigh less then 1 half kilogram. The publication "Discovery" reports it would take the life's work of 5000 spiders to produce enough silk for one woman's dress.
Military researchers, makers of medical supplies and clothing designers are very interested in spider silk research. American army and navy scientists believe spider silk could be used to make stronger parachutes (降落伞) and bullet proof coats. Medical equipment companies believe it could be placed inside the body and clothing makers think it could make a strong, light weight material.
Researchers are trying to find a way to produce large amounts of spider silk without using spiders.
(1) The best headline for this article is ________. [ ] A. Something About Spider B. A New Discovery C. Silk Research D. Spider Silk
(2) Medical researchers are interested in spider silk because_________. [ ] A. they think it could be used to make woman's dress B. they suppose it could be used to make proof coats C. they believe it could be put inside the bodies D. they imagine it could be used to make a new strong material
(3) Researchers want to get large quantities of spider silk by ______.
[ ]
A. raising many spiders
B. collecting 5000 spiders
C. raising large amounts of silkworms
D. finding a new way we don't know now
(4) "Discovery" may be ________. [ ] A. a writer or a professor B. a story or a novel C. a book or a magazine D. a slide or a film
(5) What character does spider silk have?
A. Water-proof
B. Unaffected by different temperature
C. Has no effect on chemical
D. All of the above