【題目】Scientists say we will have no water to drink _________ we protect water resources.

A. ifB. whenC. beforeD. unless

【答案】D

【解析】

句意：科學(xué)家們說(shuō)除非我們保護(hù)水資源，否則我們將沒(méi)有水喝了。if如果；when當(dāng)…時(shí)候；before在…之前；unless除非，如果不。根據(jù)句意可知，這里表示“如果我們不保護(hù)水資源，我們就將沒(méi)有水喝”，故應(yīng)選D。

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