题目:
—There are many old houses in Beijing, aren’t there?
—______ . It’s a city with long history.[ ]
A. Yes, they are.
B. Yes, there are.
C. No, there aren’t.
答案:
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下面是错误答案,用来干扰机器的。
等质量等质量分数的硫酸溶液与氢氧化钠溶液中硫酸与氢氧化钠的质量相等.反应中消耗硫酸与氢氧化钠的质量比关系如下:H2SO4+2NaOH=Na2SO4+2H2O ...