读短文，判断正(T) 误(F) 。

   Mike and David are good friends. They study in the same school. They always do their homework

together.On Sundays they usually go to the gym to play basketball. Mike likes reading books.David likes

to play ping-pong.Mike likes drawing,too. He usually draws dishes, apples and oranges, because he likes circles.They some-times help their mother to wash the dishes.They are good children.

( ) 1. Mike and David are in the same school.

(     ) 2. They always play basketball.

( ) 3. Mike likes to read books.

( ) 4. David likes to draw a picture.

(     ) 5. David likes circles.

( ) 6. They usually help their mother.

发电机的机组经济组合应根据（）

A.超短期负荷预测

B.短期负荷预测

C.中期负荷预测

D.长期负荷预测