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
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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
单项选择题
The returns in the short ____________ may be small, but over a number of years the investment will be well repaid.
A．interval
B．range
C．span
D．term
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