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单项选择题

Researchers discovered that plants infected with a virus give off a gas that （） disease resistance in neighboring plants.

A．contracts
B．activates
C．maintains
D．prescribes

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Vitamins necessary in small amounts in the diet for the normal growth and maintenance of are needed for______ foods into energy and body maintenance.
A．shifting
B．transferring
C．altering
D．transforming
单项选择题
Even if its economy continues to recover, the US is increasingly becoming a nation of p. timers and temporary workers. This ______work force is the most important trend in American business today.
A．durable
B．disposable
C．available
D．transferable
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The bird flew upward and dropped the shellfish onto the rock to______ it open.
A cut B. press C. break D. shake
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