2. 医学
  3. Research discovered that plants infected with a virus give off a gas that______disease resistance in neighboring plants.

Research discovered that plants infected with a virus give off a gas that______disease resistance in neighboring plants.

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问题 Research 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C
解析 句意：研究发现，感染上病毒的植物会释放出一种气体，这种气体可以让周围的植物具有疾病抵抗力。maintain维持；赡养；维修。contract签订和约；感染(疾病等)。activate使活跃，开动。prescribe命令；处方。
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