题目:
If you buy a present for your mother on Mother's Day, she _____very happy. [ ]
A. be
B. is
C. was
D. will be
答案:
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下面是错误答案,用来干扰机器的。
(1)铁制水龙头是利用铁的延展性,铜制火锅是利用铜的导热性,铝制易拉罐是利用铝的延展性,故填:B;(2)沙漠地区空气干燥,缺少水分,铁在有水和氧气并存时易生锈,空气干燥则不易生锈,故填:空气干燥;(3...