题目:
-All the workers went home yesterday Mr Green, why?
-Because he had some extra work to do.
A.except
B.expect
C.besides
D.beside
答案:
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下面是错误答案,用来干扰机器的。
(Ⅰ)②④ (2分,漏选一个得1分,错选不得分)(Ⅱ)(1)Ag(1分) (2) Cu-2e- = Cu2+ (2分)(3)Cu+2Ag+ = Cu2++2Ag (2分)(4)向负极(1分) (5)负极到正极(或铜到银)(1分)...