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 (丝腺) 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 (撕裂的韧带) 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

Subject:A trip to Germany (德国) From: Elizabeth

Dear Arthur,

How are you? I haven't heard from you for some time. My grandparents and I visited Germany last month. It was a great trip. We visited a number of cities in Germany and saw many interesting things

In Berlin. we went to Zoo Berlin .It is home to the largest number of animals in Germany. I felt excited because this was the first time I saw the famous little polar bear (北极熊).Knut. It was born in December, 2012. It was the first polar bear born in the zoo in the past thirty years.

Little Knut is the newest star of the zoo. People from all over the world come to see it, Knut never feels lonely because its home is always crowded with people. We also saw some grizzly bears in the zoo. They are very large and they are brown. The grizzly bears looked cute too, but I liked Knut better.

Before we left the zoo, I bought a toy polar bear like Knut.It is very cute and beautiful. I am very happy because it is like we have brought a real Knut home!

We took a lot of photos in Germany. I have put a few in this e -mail .Enjoy!

Yours,

Elizabeth

1.Elizabeth went to Germany with .

A.Arthur B.Knut C.her grandparents D.her parents

2.Why was Elizabeth excited?

A.Because Zoo Berlin is the largest zoo in Germany. B.Because she could bring Knut home.

C.Because she could feed Knut, D.Because she saw the little polar bear for the first time

3.How old is Knut?

A.12 years old. B.7 years old. C.5 years old D.3 years old.

4.How did Elizabeth show some of her photos Arthur?

A.She posted the photos to Arthur. B.She put the photos in the e-mail.

C.She gave the photos to Arthur’s mother. D.She posted the photos on her blog.

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