在税收分析实际中，通常用GDP作为总体税收收入的（）。
A.总税源
B.比较依据
C.分析基础
D.总税基
参考答案：D
两圆相交于点A（1，3）、B（m，－1），两圆的圆心均在直线x－y+c=0上，则m+c的值为（ ）
A．3
B．2
C．0
D．－1
根据句意填空。
1. —What's the _______ with you?
—I have a h_______.
—You should go to bed.
2. Mrs Green's daughter has a bad c_______ She has to take her to see a doctor.
3. If you have a s_______. you should lie down and _______.
4. Mrs Liu has a s_______ back because she has a lot of homework to do every day.
5. The girl goes to school with a big bag on her _______.
