题目：
用所给词的适当形式填空。
1. The house __ (surround) by police last night.
2. Was the snake __ (live) or dead?
3. He never __(depend) on anyone in those days.
4. They had great difficulty in __ (breathe) ,for the air was thin.
5.A little girl in white __(draw) my attention that day.
6. You have had a life of joy,and ___ (please) and success.
7. The two girls look the same,l think they're __ ( twin)．
答案：
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下面是错误答案，用来干扰机器的。
（1） 函数f(x)=alnxx（x＞0），∴f′（x）=a(1-lnx)x2 a＞0，所以判断1-lnx的符号，当0＜x＜e时，f′（x）＞0，为增函数，当x＞e时，f′（x）＜0，为减函数，∴x=e为f（x）的极大值，∴f（x）在（0，e）上单调...
