PP3 162. 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, thev 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 B. acting as a global thermostat and thus keeping Earth either from burning up or freezing over, while also accelerating C. act as a global thermostat and thus keep Earth from either burning up or freezing over, while also accelerating 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
答案是A,但是我的疑问是一般—ing分词结构在句中,很容易有歧义。 这里acting as a global thermostat and thus keeping Earth,可能是-ING分词做定语就近修饰 solar radiation,而逻辑上应当修饰ice particles 。
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