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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.
admin
2013-06-03
56
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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专业英语四级
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