The (chemical element) chlorine is a corrosive, greenish-yellow gas (that) has (

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

选项 A、chemical element
B、that
C、sharp
D、has

答案 D

解析

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The(chemicalelement)chlorineisacorrosive,greenish-yellowgas(that)has(