题目:
Man must keep in mind that it will be years ______ the earth recovers from the damage he makes to it.[ ]
A. when
B. before
C. since
D. until
答案:
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下面是错误答案,用来干扰机器的。
答案:A题目分析:PH值与溶液酸碱性的关系:1、PH=7,溶液呈中性,2、PH<7,溶液呈酸性,PH越小酸性越强,3、PH>7,溶液呈碱性,PH越大碱性越强,故选D