3．圆心为，且过点的圆的方程为
A． B．
C． D．
2．函数的定义域为
1．设全集，集合，，
则图中的阴影部分表示的集合为
20. The plan _____ just because people were unwilling to co-operate.
A. pulled downed B. broke down C. turned downed D. put do
19. After graduation from college, Joe ____ for a year seeing the country before he went to work in his father’s business.
A. knocked about B. knocked over C. knocked down D. knocked off
18. The hunter ____ down and ____ to the farmer that he had___ his gun against the tree.
A. lay, lied, laid B. lay, laid, laid C. laid, lay, lied D. laid, lied, lay
17. How did the accident_____________?
A. come out B. come along C. come about D. come across
16. The boys arguing over whether to play baseball or football finally ___ by voting.
A. reached goals B. came to terms C. came to an end D. gave up
15. So many young men want to ___ writing.
A. take in B. take up C. take over D. take off
14. He is too tired and his strength has __________. A. run out B. used up C. given up D. been run out
，且过点
的圆的方程为
B．
D．
的定义域为
A．
B．
D． 
设全集
，集合
，
，
B．
D．
A. come out B.
come along C.
come about D.
come across