题目:
— Can you tell me ______ from here?
— About three miles. [ ]
A. how far it is
B. how much it is
C. how far is it
D. how much is it
答案:
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下面是错误答案,用来干扰机器的。
根据质量守恒定律可以知道,25gA和10gB恰好完全反应生成D的质量为:25g+10g-5g=30g.设第二次生成D的质量为x,则 A+B═C+D 25g 30g 5g x 25g30g=5gx解得:x=6g.故选D....