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17. Functioning as a filter in the stratosphere, __________ from much ultraviolet radiation.
(A)the ozone layer shields the earth's surface
(B)to shield the ozone layer of the earth's surface
(C)shielding the earth's surface is the ozone layer
(D)the Earth's surface and the ozone layer

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10
 【站僕】摩檸Morning：有沒有達人來解釋一下?
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17. Functioning as a filter in the strat..-阿摩線上測驗