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  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.

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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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