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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单项选择题
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.
D．It lies in the opportunity to continue the search.
单项选择题
What is the meaning of success in the general sense of the term
A．It means the opportunity to experience and to realize to the maximum the forces that are within us.
B．It means great worldly achievements or accomplishments or wealth.
C．It means being on the top of the social ladder.
D．It means the search for truth.
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