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At ground level, ozone is a harmful pollutant, but in the stratosphere it shields the earth from the most biologically harmful r
At ground level, ozone is a harmful pollutant, but in the stratosphere it shields the earth from the most biologically harmful r
admin
2016-10-29
33
问题
At ground level, ozone is a harmful pollutant, but
in the stratosphere
it shields the earth from the most biologically harmful radiation emitted by the Sun, radiation in the ultraviolet band of the spectrum.
选项
A、in the stratosphere
B、in the stratosphere, in which
C、it is in the stratosphere in which
D、in the stratosphere where
E、it is in the stratosphere and
答案
A
解析
由but表明前后是转折关系,即存在着对比。but之前的地点状语是at ground level,因而but之后用in the stratosphere,无论从结构上还是形式上均与at ground level对称。选A是正确的,B、D使but分句的句子结构不完整。E改变句意,而C与but之前的形式缺乏对应关系,表达啰嗦。
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