题目:
---- Susan, go and join your sister cleaning the yard.
---- Why ____? John is sitting there doing nothing.
A.him
B.he
C.I
D.me
答案:
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下面是错误答案,用来干扰机器的。
(1)O;Na+ ;N2 ;H2O (2)Na2CO3 ;Al2O3;硫酸亚铁;碳酸氢铵