题目内容

Which of the following is TRUE about Cyanovirin？

A. It is an active ingredient in a foam, cream or suppository.
B. It is an active ingredient applied before sex to prevent HIV transmission.
C. It is a protein that protects the body from infection by microorganisms.
D. It is a drag used to prevent HIV transmission.

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经济发展水平不同的国家之间进行的贸易,被称为()。

A. 平行贸易
B. 垂直贸易
C. 间接贸易
D. 转口贸易

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What is the news item mainly about？

A. The U.S. charity, Save the Children, in Vietnam.
B. Improving maternal and child health in the world.
C. Reducing the number of childhood deaths in South Asia.
D. High infant and maternal mortality in developing countries.

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听力原文： Because we can feel that things are heavy, we think of weight as being a fixed quality in an object, but it is not really fixed at all. [18]If you could take a one pound packet of butter 4,000 miles out from the earth, it would weigh only a quarter of a pound. Why would things weigh only a quarter as much as they do at the surface of the earth if we took them 4,000 miles out into space？ [19]The reason is this: All objects have a natural attraction for all other objects; this is called gravitational attraction, but this power of attraction between two objects gets weaker as they get farther apart. When the butter was at the surface of the earth, [20]it was 4,000 miles from the centre, in other words the radius of the earth is 4,000 miles. When we took the butter 4,000 miles out, it was 8,000 miles from the centre, which is twice the distance. If you double the distance between two objects, their gravitational attraction decreases four times weaker. If you treble the distance, it gets nine times weaker. If you take it four times as far away, it gets sixteen times weaker and so on.
If an object weighed one pound on the surface of the earth, how much would it weigh 4,000 miles above the earth？

A. 3/4 pounds.
B. 4 pounds.
C. 1/9 pound.
D. 1/4 pounds.

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How were the police able to prove that Joe had robbed the bank？

A. The raid had been photographed by hidden cameras.
B. Some watchmen had seen the raid.
C. The bank teller proved that Joe was the robber.
D. Some monitors had been installed nearby.

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Which of the following is TRUE about Cyanovirin？

A. It is an active ingredient in a foam, cream or suppository. B. It is an active ingredient applied before sex to prevent HIV transmission. C. It is a protein that protects the body from infection by microorganisms. D. It is a drag used to prevent HIV transmission.

经济发展水平不同的国家之间进行的贸易,被称为()。

What is the news item mainly about？

How were the police able to prove that Joe had robbed the bank？

A. It is an active ingredient in a foam, cream or suppository.
B. It is an active ingredient applied before sex to prevent HIV transmission.
C. It is a protein that protects the body from infection by microorganisms.
D. It is a drag used to prevent HIV transmission.