Maybe your math teacher has taught you how to find the center of a circle. It isn't easy to learn and it takes you _____41____to do so. ___42____ an easy method(方法).This method can be easily learned ____43_____ a few minutes.

____44____ a corner of a square(正方形) piece of paper on the circumference (圆周) of　 a ___45___ circle, and you’ll see the two sides of the piece of paper ____46____ the circle. And then you'll ___47___ two points on the circumference. You may name _____48____Point A and Point B. You may be ___49_____that Points A and B are _____50____two ends of the diameter(直径). Draw a straight line _____51_____ the two Points A and B. Then do the ____52____ thing a second time in a different place to get another diameter. You'll ___53____ the center at once: 　the two lines cross at a point and this point is ____54______ the center of the circle.

How about trying to see ____55____ it is easy to learn and remember this simple method of finding the center of a circle?

(　　 ) 41. A. sometimes　　 B. sometime　　 C. some time　　 D. some times

(　　 ) 42. A. That's　　　　 B. Here's　　　　 C. It's　　　　　 D. What's

(　　 ) 43. A. on　　　　　 B. at　　　　　 C. in　　　　　 D. for

(　　 ) 44. A. Draw　　　　 B. Bring　　　　 C. Take　　　　 D. Put

( 　　) 45. A. given　　　　 B. giving　　　 C. give　　　　 D. gave

(　　 ) 46. A. meet　　　　 B. through　　　　 C. arrive　　　　 D. pass by

(　　 ) 47. A. talk　　　　　 B. draw　　　　 C. mean　　　 D. get

(　　 ) 48. A. it　　　　　　 B. them　　　　 C. yourselves　　 D. which

(　　 ) 49. A. sure　　　　　 B. afraid　　　 C. pleased　　　 D. worried

(　　 ) 50. A. another　　　 B. a　　　　　 C. other　　　　 D. the

(　　 ) 51. A. by　　　　　 B. through　　　 C. behind　　　 D. before

(　　 ) 52. A. different　　　 B. only　　　　 C. same　　　　 D. simple

(　　 ) 53. A. find　　　　　 B. look for　　　 C. found　　　 D. search

(　　 ) 54. A. only　　　　　 B. certain　　　 C. just　　　　 D. correct

(　　 ) 55. A. if　　　　　　 B. how　　　　 C. that　　　　 D. why

40. He asked me if there was _________________or not in today’s newspaper.

　　　 A. anything important　　　　　　 B. something important 　

　　　 C. important everything　　　　　　 D. nothing important

39. I know the man ________________________.

　　　 A. who you’re talking about him　　　 　　B. who you’re talking

　　　 C. that you’re talking to　　 　　　　　　D. you’re talking to him

37.Something has been done to stop the pollution. The air now is ____ than it was two years ago

　　　 A. even worse　　　 B. much better　　 C. less good　　　　 D. too bad

(　 ) My aunt will get ______ Paris _______ plane _______ the morning of April 5.

　　　 A. to　 by　 on　　　 B. at　 on　 in　　 C. on　 by　 in　　 D. to　 on　 at

36. He didn’t tell me ________________.

　　　 A. which room to live　　　　　　　 B. the room which he lived

　　　 B. he lived in which room　　　　　　 D. which room he lived in

35. ---My watch doesn’t work. Could you help me to mend it?

　　　　 ---Sorry. But the workers in the shop may be _____________.　　　　　

A. friendly　　　　 B. grateful　　　　 C. glad　　　 　　　D. helpful

34. ---I don’t know if he _______tomorrow.　 ---If he _______. I’ll tell him about it.

A.　　 comes, comes 　　　　　　B. will come, will come

C. will come, comes　　　　　 D. comes ,will comes