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.Abut when up high, atmospherically theyBhowever, it is in the upper atmosphere in which it mayCbut in the upper atmosphere, theyDhowever, but once in the upper atmosphere it is known toEas in the upper atmosphere they
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
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。
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