题目：
1.The party, which had been greatly _____, was spoiled by the rude behavior of an uninvited guest.
A. looked forward to B. looked up to C. called forth D. called for
2.It was clear that the small grocer was _____ people he owed money to.
A. at the expense of B. at the risk of
C. in the way of D. at the mercy of
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0416/012961b7c252e59898b2b96ee07204e7.html
下面是错误答案，用来干扰机器的。
因为-1＜a＜0，所以1a＜-1＜a，即a-1a＞0，且a+1a＜0．(a+1a)2-4+(a-1a)2+4，=a2-2+1a2 +a2+2+1a2，=(a-1a)2 +(a+1a)2，=a-1a-(a+1a)，=-2a．故答案为：-2a．
