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【单选题】

Research discovered that plants infected with a virus give off a gas that______ disease resistance in neighboring plants.
A．contracts

B．activates
C．maintains
D．prescribes
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根据网考网移动考试中心的统计，该试题：

0%的考友选择了A选项

46%的考友选择了B选项

53%的考友选择了C选项

1%的考友选择了D选项

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