Researchers discovered that plants infected with a virus give off a gas that ___

游客2024-10-11 28

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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