3.如图,一个几何体的主视图与左视图都是边长为2的正方形,其俯视图是直径为2的圆,则该几何体的表面积为____　 ___.

2.设(为虚数单位),则=____　 ____.

1.已知角的终边过点(－5,12),则=____　 ____.

15. -When Lily fainted, we could have turned to your father for help.

　 -Yes, sending her to hospital _________ necessary.

A. hadn’t been　　　　　　　　　　 B. wasn’t　　　　　　　　　　　 C. wouldn’t be　　　　　　　　　　 D. weren’t

14. Since the H₁N₁ flu is spreading, it’s necessary that whoever has a fever _________ to hospital as soon as possible.

A. went　　　　　　　　　　　　 B. must go　　　　　　　　　　 C. has gone　　　　　　　　　 D. go

13. The struggle against the bird flu and the suffering _________ brought about have become a big concern across the world.

　　　 A. which has　　　　　　　　 B. it is　　　　　　　　　　　　　 C. it has　　　　　　　　　　　 D. what is