单项选择题

In scores of experiments, scientists are changing the genetic endowments of plants and animals, and the results could______ a revolution in farm fields, feedlots and dairy barns.

A．Spawn
B．bring
C．instigate
D．plot
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单项选择题
Research 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
单项选择题
Remember to ask for a______ of quality for the consumer goods; otherwise they will not of- fer any maintenance.
A．certificate
B．mark
C．warranty
D．receipt
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