A group of scientists from Sweden have unlocked one of nature's biggest secrets. The scientists have worked out how spiders make such strong silk when they build their webs. The silk that spiders make is strong and even tougher than steel. Being able to produce man-made spider silk has long been a dream of many scientists. Now, researchers from the Swedish University of Agricultural Sciences have, step by step, developed a method that works. They've found that the materials for webs arc in a spider's silk gland (絲腺) as protein. The gland has a level of acidity (酸度) that helps make the protein into very strong silk. The researchers reported that they could produce man-made spider silk by copying the process.

The new man-made silk could be very useful to humans. Doctors are interested in it. They think it can help people get well after a bum. Some doctors believe the new silk could be used to take the place of the torn ligaments (撕裂的韌帶) in the body. Plane makers and makers of protective clothing also see many uses for the new silk.

Senior researcher Anna Rising spoke about how ▲ the new discovery could be. She said, "This is the first successful example of copying spider silk-making process. In the future, this may allow industrial production of man-made silk, which can be used in many fields and make our life much better. The silk could become a valuable material for us."

1.The man-made silk can be used (o do many things EXCEPT .

A.help patients get well B.build excellent planes

C.stop ligaments being torn D.make protective clothing

2.Which of the following can be put in ▲ ?

A.simple B.important C.awful D.boring

3.According to Anna Rising, the new material .

A.will improve our life a lot B.can help fight air pollution

C.will take the place of many other materials D.can help us make more scientific discoveries

4.What's the best title for the passage?

A.Spider silk is good for humans B.Scientists from Sweden are great

C.Making spider silk is now possible D.Making scientific discoveries is hard

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