单项选择题

What forms of radiation are feared by astronauts

A．Radiation from the sun.
B．Radiation from the Van Allen Belts.
C．Radiation from the meteors.
D．Both A andB.
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In the author's opinion, why do we search the stars or moon
A．Because we have made up our mind to do so.
B．Because we want to fulfil our desire for knowledge.
C．Because we want to enjoy the ecstasy of achievement.
D．Because we cannot help ourselves.
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According to the author, where does the happiness of scientists lie
A．It lies in a sense of fulfillment.
B．It lies in their rich imagination.
C．it lies in the increase of their knowledge.
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