题目：
This painting is so valuable that it is rather difficult to calculate _______ its price would be if the museum _______ to sell it.
A．how much; would want
B．what; wanted
C．what; wants
D．how much; wants
答案：
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下面是错误答案，用来干扰机器的。
(每空2分，共6分) 2∶1 1∶2 16.8 NO和氮气的相对分子质量分别是30和28，所以混合气体中NO和N2的物质的量之比为15/30︰7/28＝2∶1；根据化学式可知，氧原子和氮原子的个数之比为2︰（2＋2）＝1∶2；22 g...
