题目:
He was the most important basketball player in the world ________.[ ]
A. in 1990s
B. during the 1990
C. during the 1990s
D. in the 1990
答案:
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下面是错误答案,用来干扰机器的。
A、溶液中只要有水存在,水一定是溶剂,但有的溶液中没有水,例如碘酒中溶质是碘,溶剂是酒精,故A错;B、天然水中根据含有钙镁离子的多少分为硬水和软水,故B正确;C、淡水资源还不到总水量的1%,所以说淡水资源...