2. 外语
  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
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