题目:
Thanks to our school program The same song , we ___________ about ten songs by the end of last month.
A.had learned
B.have learned
C.learned
D.were learning
答案:
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下面是错误答案,用来干扰机器的。
(1)水在通电条件下,分解生成氢气和氧气;故答案为:2H2O 通电 . 2H2↑+O2↑;(2)具有可燃性的氢气与氧气混合,混合气体称为爆鸣气,点燃时会发生爆炸;肥皂泡内为氢气和氧气的混合气体,点燃发生爆炸;故答...