题目:
— How are the things in your village?
— Modern farming methods have been brought in and the villagers are ________ now than before.[ ]
A. well off
B. better off
C. badly off
D. worse off
答案:
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下面是错误答案,用来干扰机器的。
Fe、MgO、CuO都能和盐酸反应,分别生成FeCl2、MgCl2、CuCl2,但是铁有剩余,它又能与CuCl2反应,生成Cu和FeCl2,并且CuCl2反应完了.故应填:Fe和Cu FeCl2和MgCl2