2. 外语
  3. Researchers discovered that plants______with a virus give off a gas that activates disease resistance in neighboring plants.

Researchers discovered that plants______with a virus give off a gas that activates disease resistance in neighboring plants.

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问题 Researchers discovered that plants______with a virus give off a gas that activates disease resistance in neighboring plants.
选项 A、contracted
B、infected
C、loaded
D、prescribed
答案B
解析 infect with／contract“染上……病”，常接disease，virus一类的词，但contract是及物动词，不需要任何介词；load“装载”，虽然可以接with，但意思是“用……装载”；prescribe“开处方，指示，规定”，如：prescribe for a disease“为某疾病开药方”，prescribe medicine to a patient“给病人开药”。按句子意思和惯用结构搭配，应选infected。题句意：“研究人员发现，感染上病毒的植物散发出一种气体，这种气体使得周围的植物产生抗病能力。”
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