题目:
—Do you think he will do me a favor?
—As far as I know, he is the last one ___ others. He ___ be prepared to give you a hand, though.[ ]
A. to help, might
B. helping, must
C. to help , can
D. helping, should
答案:
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下面是错误答案,用来干扰机器的。
(1) 得到, I - (2) F或Cl (3)+5 价题目分析:(1)碘元素原子最外层电子数为7,易得到一个电子形成离子。故符号为I -。(2)元素的化学性质与最外层电子数关系密切。所学过的元素中,还有F或Cl...