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【单选题】

The (chemical element) chlorine is a corrosive, greenish-yellow gas (that) has (sharp) odor and (has) 21/2 times heavier than air.

A、chemical element
B．that
C．sharp
D．has
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根据网考网移动考试中心的统计，该试题：

7%的考友选择了A选项

17%的考友选择了B选项

20%的考友选择了C选项

56%的考友选择了D选项

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