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

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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、prescribe

答案B

解析本题为动词词义辨析题。contract意为"收缩"；maintains意为"维持；维修；供养；主张"；prescribe意为"开(药方)；规定"；activate意为"使开始起作用"，与其后的disease resistance形成动宾搭配，意为"激活抗体"。故选项activates为正确答案。

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考研英语一

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

考研英语一

Animportantfactorofleadershipisattraction.Thisdoesnotmeanattractivenessintheordinarysense,forthatisabornqua

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Sinceourknowledgeis______,noneofuscanexcludethepossibilityofbeingwrong.

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