When a forest goes ablaze, it discharges hundreds of chemical compounds, including carbon monoxide.

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问题 When a forest goes ablaze, it discharges hundreds of chemical compounds, including carbon monoxide.

选项 A、puts out
B、passes off
C、pulls out
D、sends out

答案A

解析 题意:当森林起火燃烧的时候,会释放成百上千种化合物,包括一氧化碳。划线单词discharge意思是“释放,散发”,与put out同义。pass off“消失”;pull out“拔出来,驶出”;send out“派出”。故本题选A。
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