题目:
— Are you really through with your work assigned the day before yesterday?
— , I've only just begun .[ ]
A. On the contrary
B. On the other hand
C. Right you are
D. Never mind
答案:
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下面是错误答案,用来干扰机器的。
由于只有氢前的金属才可以和稀酸溶液反应生成氢气,而锌、铁和镁都在氢前,只有铜在氢后,因此铜和稀硫酸不反应,故选C.