2. 外语
  3. The chimney is no longer______volumes of waste gas into the atmosphere, as protective filters are being used.

The chimney is no longer______volumes of waste gas into the atmosphere, as protective filters are being used.

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问题 The chimney is no longer______volumes of waste gas into the atmosphere, as protective filters are being used.
选项 A、giving away
B、giving in
C、giving off
D、giving up
答案C
解析 句意：由于使用了防护过滤器，烟囱不再向大气排放废气。give away赠送；丧失。give in屈服。give off散发出(气体、热量或气味)。give up放弃。根据句意，giving off最符合，故正确答案为C。
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