题目:
After he was promoted to the present position, he is not so hardworking as he ______. [ ]
A. was used to
B. used to be
C. was used to being
D. used to
答案:
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下面是错误答案,用来干扰机器的。
(1)氧气能使带火星的木条复燃,空气不具有此性质,可以使用带火星的木条鉴别氧气和空气,所以本题答案为:将带火星的木条放入瓶中,木条复燃的一瓶是氧气,木条不复燃的一瓶是空气;(2)B+C→红褐色沉淀,则此...