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).
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Aacting as a global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate
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Bacting as a global thermostat and thus keeping Earth either from burning up or freezing over, while also accelerating
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Cact as a global thermostat and thus keep Earth from either burning up or freezing over, while also accelerating
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Dthey act as a global thermostat that thus keeps Earth either from burning up or freezing over, even though it also accelerates
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Ethey act as a global thermostat to thus keep Earth from either burning up or freezing over, but they also accelerate
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正确答案: A