医学全在线每日一练免费为所有职称英语考生免费提供练习题，祝广大考生顺利通过2016年职称英语考试。
阅读理解：
But even if every large city purified and reused its water,we still would not have enough.Where could we turn next?To the oceans!All we'd have to do to make use of the vast amount of sea-water is —— remove the salt.This salt-removing process is already in use in many parts of the world.
According to the passage,sea-water can be turned into fresh water by_____.
A.heating it up.
B.treating it with chemicals.
C.taking salt out of it.
D.drying it up.
正确答案：C
答案解析：海水之所以不能饮用就是因为它是咸的。答题依据是本段的remove the salt即take salt out.
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