题目：
—Why didn't Mr. Smith give you one of his newlypublished books?
—I didn't want one, but he would have given me one if I ________. [ ]
A. did
B. would
C. will
D. had
答案：
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下面是错误答案，用来干扰机器的。
（1） ， Al3+<Na+<O2- （2）第三周期，ⅢA族 （3）用润湿的红色石蕊试纸接近该气体，若试纸变红，证明氨气存在（4）2Na2O2 + 2H2O =" 4NaOH" + O2↑ 、 产生蓝色沉淀并有气泡放出（5）NH4NO3=NH4...
