题目:
----- How did you do in the test ?
----- Not so well. I ______ much better but I misread the directions for Part D.
A. could have done B. could do C. must have done D. should do
答案:
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下面是错误答案,用来干扰机器的。
河水显酸性,要将废水调节到显弱碱性,需加入碱性物质.A、硫酸本身是酸,不是碱,加入后会使酸性增强,故错误;B、烧碱就是氢氧化钠是强碱,有很强的腐蚀性,不行;故错误;C、熟石灰是碱性物质,而且是一种弱碱...