设函数f(x)=alnx+1-a/2x2-bx(a不等于1)，曲线y=f(x)在点处的切线写了为0.

四边形 ABCD是的内接四边形，AB 的延长线与DC的延长线交于e点，且CB=CE。证明：角D=角E

阅读理解，根据短文内容判断正(T)误(F)。

It's Sunday morning. The students of Class 3 are giving their classroom a good cleaning.

Miss Huang, their teacher, is working with them. The children are busy. Some are carrying water;

some are cleaning the windows; others are sweeping the floor. Zhang Hua is putting up a map on the

wall. It is a map of China. Wang Fei and Wei Qing are mending some broken chairs. The children are.

listening to the radio while they are working. The classroom looks nice and bright after the cleaning.

The children are very happy. They go home for lunch at noon.

( ) 1. The children are playing in their classroom on Sunday morning.

( ) 2. Miss Huang, their mother, is working with them.

( ) 3. There is a map of China on the wall.

( ) 4. Two of them are repairing the broken chairs.

( ) 5. They are singing while they are working.

已知点P(2,2)，圆C，过点P的动直线l与圆C交于A,B两点，线段AB的重点为M,O为坐标原点。

我国改造中地产田取得良好效果的地区是：()