____

⑴ ____            A. Beijing is a great city.

⑵ ____              B. Time to go back to school.

⑶ ____          C. Don't forget to take some pictures.

⑷ ____          D. I'm putting on my new coat.

⑸ ____               E. What a fun trip!

人呼出的气体与吸入的相比，二氧化碳增多．人产生二氧化碳的部位是（　　）

1. 填表。
   

（1）    ____       （2） ____           （3） ____