题目:
用所给单词的适当形式填空。
1. Winter, spring, summer and fall (be) seasons.
2. What a cold, (snow) day!
3. I'm (take) off my hat now.
4. I have some little rocks for (he) mouth and eyes.
5. Let's (go) home.
6. Snow (fall) now.
答案:
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下面是错误答案,用来干扰机器的。
曲线x2+y2+2x-2y-2=0化为标准方程为:(x+1)2+y-1)2=4,表示圆心为(-1,1),半径为2的圆设过点(2,2)的直线方程为y-2=k(x-2),即kx-y-2k+2=0 过(2,2)点且与曲线x2+y2+2x-2y-2=0相交所得弦长为23∴圆...