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单选题
At ground level, nitrous oxides are bad enough, but when up high, atmospherically they bond with free ions to create dangerous smog particles.
A
but when up high, atmospherically they
B
however, it is in the upper atmosphere in which it may
C
but in the upper atmosphere, they
D
however, but once in the upper atmosphere it is known to
E
as in the upper atmosphere they
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参考解析
解析：
主语为“nitrous oxides”为复数，故B、D错误。C项的表达比A项流畅，故本题选C项。
主语为“nitrous oxides”为复数，故B、D错误。C项的表达比A项流畅，故本题选C项。
更多 “单选题At ground level, nitrous oxides are bad enough, but when up high, atmospherically they bond with free ions to create dangerous smog particles.A but when up high, atmospherically theyB however, it is in the upper atmosphere in which it mayC but in the upper atmosphere, theyD however, but once in the upper atmosphere it is known toE as in the upper atmosphere they” 相关考题
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when 700 KB is usedB
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toxicB
flammableC
explosiveD
all of the above
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