2. 外语
  3. Researchers discovered that plants infected with a virus give off a gas that ______ disease resistance in neighboring plants.

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

admin2013-06-03  85
问题 Researchers discovered that plants infected with a virus give off a gas that ______ disease resistance in neighboring plants.
选项 A、contracts
B、activates
C、maintains
D、prescribes
答案B
解析 动词辨析。contract意为“感染”；activate意为“刺激、使活动”；maintain意为“维持”； prescribe意为“规定、开处方”。根据句意应选activates。
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