用am，is，are填空。

1. Excuse me! ________ this your eraser?

2. What ________ those?

3. This ________ his ruler.

4. I ________ Mary. Are you Anna?

5. ________ these her English books?

6. Those ________ her pencils.

7. She ________ my sister.

8. He ________ my friend.

9. ________ those maps? No, they aren't. They are pictures.

10. These are your dictionaries. Here you ________.        

麻醉前应用抗胆碱药物的作用是()。

A．镇静

B．镇痛

C．减少呼吸道分泌物

D．对抗局麻药毒性

E．抑制交感神经兴奋