读短文，判断正(√)误(×)。

      Welcome to the Children's Centre. You can do many things here. Look, there are many children. This is

Chen Jie. She's drawing pictures. Mike is watching insects. Amy is reading a storybook. Wu Yifan is playing

chess with a man. Who's the man? He's Mr Black, Wu Yifan's math teacher. He's a smart man. John and Sarah

are taking pictures. Where's Bai Ling? Look! She's over there. She's writing a report. Her sister is singing and

playing the piano.

( ) 1. Chen Jie is taking pictures.

( ) 2. Amy is reading a book.

( ) 3. Mr Black is playing chess.

( ) 4. John is drawing pictures.

( ) 5. Bai Ling is writing an e-mail.

手术创伤后高血糖的原因有（）

A.儿茶酚胺浓度升高致糖原分解降低

B.儿茶酚胺抑制胰岛素分泌，降低机体对糖的利用率

C.胰高血糖素分泌增加

D.糖异生作用减慢

E.营养过剩