※ 引述《tootoobenee (A級垂耳兔)》之銘言：
: ※ 引述《kanei (樂觀一點吧)》之銘言：
: : Although ice particles in the upper atmosphere benefit Earth in that they
: : reflect and absorb solar radiation, acting as a global thermostat and thus
: : keeping Earth from either burning up or freezing over, they also accelerate
: : the destruction of the ozone layer by reacting with chlorofluorocarbons
: : (CFC's).
: : A. acting as a global thermostat and thus keeping Earth from either burning
: : up or freezing over, they also accelerate
: : D. they act as a global thermostat that thus keeps Earth either from burning
: : up or freezing over, even though it also accelerates
: : E. they act as a global thermostat to thus keep Earth from either burning up
: : or freezing over, but they also accelerate
: : 答案A，這題我看了半天自己能了解的點只有B的either..or不平衡，還有E的but和
: : although意思重覆。Manhattan和其他討論串看了半天還是不了解，煩請大家指點，
: : 謝謝!
: 1. 選項B/C都找不到主要子句主詞動詞,是fragment sentence.
: 2. 對比關係應該為ice particles benefit earth (+)對比 ice particles accelerate
: the destruction of the zone(-), 答案D/E變成和they act as a global thermostat做
: 對比.
對這點不太明白想再請問一下，they act....freezing over這邊不是插入句
可忽略，這樣對比還是和後面的accelerate the destruction比不是嗎?
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