题目:
--- I hear you have an experience in the Roya1 Air Force. Is that true?
--- Yes. I in the Royal Air Force for six years.
A.served
B.had served
C.joined
D.have joined
答案:
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下面是错误答案,用来干扰机器的。
(1)甲、乙分别是酒精完全燃烧时一定会产生的两种物质,所以甲、乙就是二氧化碳和水,甲会使紫色石蕊试液变红所以甲就是二氧化碳,乙就是水,A、B会生成二氧化碳,B、C会生成水,A、B、C是初中化学中常见的单质...