题目内容

Velcro is probably the most famous and certainly the most successful example of biological mimicry, or "biomimetics".

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The result was Velcro, a product that was arguably more than ______years in the making, since that is how long the natural mechanism that inspired it took to evolve.

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Engineers and biologists work together to find natural solutions to technological problems.

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Wheels work well on flat surfaces, but are ______.

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Questions 7 and 8 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each of the two questions. Now listen to the news. Michael Chertoff defends himself asserting that he made the deal because

Arabic terrorists will not attack the USA any more.
B. it is essential to maintain an active trading environment.
C. there is no need to block a company’s control over terminals.
D. it is not fair to cut off business with foreign companies.

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