【題目】Water covers 71% of Earth’s surface yet only 2% of it is_____ as a source of fresh water.

A.invaluableB.accessibleC.valuableD.reasonable

【答案】B

【解析】

考查形容詞詞義辨析。句意：地球表面的71%被水覆蓋，但只有2%的淡水資源可以利用。A. invaluable無價的；B. accessible可使用的；C. valuable貴重的；D. reasonable合理的。根據(jù)“as a source of fresh water”可知，此處表示“可使用的淡水資源”，故B項正確。

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