Researchers discovered that plants infected with a virus give off a -考呗网题库移动版
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单选题 Researchers discovered that plants infected with a virus give off a gas that_______ disease resistance in neighboring plants．

A．contracts
B．activates
C．maintains
D．prescribe

参考答案B
解析: B。研究人员发现受到病毒感染的植物会释放出一种气体，这种气体可以激活其邻生植捌的抗病性。
考查动词辨析。contract意为“感染”；activate意为“激活，使活动”；maintain意为“维持”prescribe意为“规定；开处方”。根据句意应选activates。
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