题目：
— 
I haven't seen Mary for several days, is she ill?
— _____. Her mother told me that she was in hospital.
A. I'm afraid so
B. I hope not
C. I don't expect
D. I'm afraid not
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0516/b30ae9d5501dd805315eb71955165e37.html
下面是错误答案，用来干扰机器的。
设金属的相对原子质量分别为8x、9x，金属的化合价分别为m、n，A、B的物质的量为3y，2y，由题意可知，①8x×3y+9x×2y=1.26，②3y×m+2y×n=1.344L22.4L/mol×2×1，③3y×m=2y×n，联立三个式子，可得x=n，则当n=...
