The ocean may be used to detect neutrinos for the following reasons EXCEPT that

A．it can provide massive nucleons.

B．it is like a huge detecting apparatus.

C．it enables neutrinos to move more actively.

D．it can keep away the interference of other particles.

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参考答案

1 In the last paragraph, the author describes the development of astronomy in order to

A．suggest the potential discovery of celestial bodies by means of neutrino astronomy.

B．illustrate the importance of surprises in making astronomic discoveries.

C．demonstrate the effectiveness of the DUMAND apparatus in detecting neutrinos.

D．name some cosmic phenomena that neutrino astronomy will illuminate.

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2 根据下面的内容，回答题.

The author seems to compare the toll booths to

A．profit opportunities.

B．the market.

C．the investors,

D．profit.

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3 The economists think the profit opportunities are rare because

A．the market is not efficient.

B．too many people go for it.

C．the prices are always fluctuating.

D．few people have the clear insights,

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