The flares that are Aused as distress Bsignals contain Cchemists that produce in

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问题 The flares that are Aused as distress Bsignals contain Cchemists that produce intense Dcolors.

选项 A、
B、
C、
D、

答案 C

解析 Chemists is a noun for people. A noun for things is needed. Correction: chemicals.

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ANeareveryhousecontainsatleastsomewood,BbutinplaceswheretreesareCp