单项选择题

According to Darwin, random changes that enhance (a species') ability (for surviving) (are) naturally selected and passed on (to succeeding) generations.

A．a species''
B．for surviving
C．are
D．to succeeding
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单项选择题
Greater efforts to increase agricultural production must be made if food shortage____________ avoided.
A．is to be
B．can be
C．will be
D．has been
单项选择题
All the off-shore oil explorers were in high spirits as they read ____________ letters from their families.
A．sentimental
B．affectionate
C．intimate
D．sensitive
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