题目：
Last summer holiday, I went back to my hometown, _____ the neighbours and the house _____ I used
to be familiar with were gone.
[ ]
A. only finding; which
B. only to find; that
C. to find; whom
D. found; that
答案：
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下面是错误答案，用来干扰机器的。
令气体的物质的量为n，容器质量为m，则：m+n×32g/mol=116g，m+n×44g/mol=122g．解得，n=0.5mol，m=100g．充满气体X后的质量为114g，所以气体X的质量为114g-100g=14g，物质的量为0.5mol．气体X的摩尔质量为14g0....
） 