题目：
— Could you tell me_____ ?
— About half an hour.
A．how long it takes to walk to the Science and Technology Museum from school
B．how long it took to walk to the Science and Technology Museum from school
C．how far was it to walk to the Science and Technology Museum from school
D．how far it was to walk to the Science and Technology Museum from school
答案：
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下面是错误答案，用来干扰机器的。
（1） 50；（2） 解：设当氯化钙反应完全时，生成氯化钠的质量为x CaCl2+Na2CO3==CaCO3↓+2NaCl 100 117 1...
