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题库 / Prep2007E2-SC-43
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).
acting as a global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate
acting as a global thermostat and thus keeping Earth either from burning up or freezing over, while also accelerating
act as a global thermostat and thus keep Earth from either burning up or freezing over, while also accelerating
they act as a global thermostat that thus keeps Earth either from burning up or freezing over, even though it also accelerates
they act as a global thermostat to thus keep Earth from either burning up or freezing over, but they also accelerate
D选项的it没有指代对象，accelerate的主语应该是they
前半句although，后半句应该没有连词，故只有A正确
千万不能看到although就想要在后面跟逻辑主语，这种思维定式不可取、
A: 无问题，they与首句的they都代指ice particles
B: while和alough都是连词，没有主句主语
C: 与B问题一样
DE : 结构变了，第一句是主句。意思错了不说，D的it，ethier or也有问题
把握语义来解题。
语义应该是说，ice particles 能对地球有好处，act as后面的其实是对地球有好处的东西，所以DE不能用，因为DE转折应该是跟一个负面的东西。B没有谓语C没有主语？
although...while....句式❌
这道题犯智障错误了，看到although就想着后面要跟逻辑主句，选了they开头，忽略了最低级的错误，although／but／even though怎么能同时出现啊？？？？？？
choice a ,acting as a global thermostat and thus keeping Earth from either burning up or freezing over作为伴随状语修饰reflect and absorb solar radiation
A. Correct Usage
B. error 1 - either-or formation is not parallel; error 2 - although...while formation is incorrect
C. error 1 - verb act does not modify the clause preceding it; error 2 - although...while formation is incorrect
(A) 正确，原文的acting and keeping是作benefit的伴随状语，解释如何benefit Earth。Although ice particles benefit..., they also accelerate the destruction...，原文要表达这样一个对比：尽管有益，也有害。
用either or可以排除BDE C选项句子缺少主语
either or只能排除B.D吧。。。
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