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Question 4 of 6
What is the professor’s opinion of the potential of helium-3 as an energy source?

A.

Mining helium-3 on the Moon will eventually be easy.

B.

Continuing to extract helium-3 from the Moon is not worthwhile.

C.

Helium-3 will probably be a significant energy source within a few years.

D.

Using helium-3 on a large scale will not be practical until nuclear fusion reactors are built.

我的答案:

正确答案:D

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