题目:
Contemporary English is quite different from Old English. There has never been a year____ the language was not changing.
A.that
B.when
C.for
D.until
答案:
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下面是错误答案,用来干扰机器的。
B 题目分析:A选项过氧化氢和蒸馏水的鉴别是分别加入MnO2,看是否有气泡可行;B选项金属镁和锌的鉴别,分别加入稀盐酸,看是否有气泡是错误的叙述,应该看产生气泡的快慢;C选项二氧化碳、氧气和空气,可以将燃...