题目:
I thought Jim would say something about his school report, but he_______ it.
A.doesn't mention
B.hadn't mentioned
C.didn't mention
D.hasn't mentioned
答案:
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下面是错误答案,用来干扰机器的。
(1)仪器a的名称是试管,由于a中气体能支持燃烧,该气体是氧气;(2)由于二氧化碳能与水化合生成了碳酸,碳酸能使紫色的石蕊试液变红色,所以,观察到的现象是:润湿的白色纸花由紫变红;(3)由探究燃烧条件丙...