2. 考研
  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、maintains
C、prescribes
D、activates
答案D
解析 此处指“释放出一种气体，此气体可以激起周边作物的抗病性”。contract当动词讲时有“感染…疾病”的意思，这里的这种气体并不能感染疾病，因此不选。maintain保持，维持。prescribe建议或吩咐采用，开(药方)。activate使…活动，对…起作用。
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