【題目】I like hiking in the forest because the air is pretty ______.

A. free B. dirty C. polluted D. fresh

【答案】D

【解析】試題分析：句意：我喜歡在森林中徒步旅行因為空氣很新鮮。free空閑的；dirty臟的；polluted污染的；fresh新鮮的。所以選D。

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