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    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.This method can be easily learned 43 a few minutes. 44 a corner of a square piece of paper on the circumference 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. 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 【查看更多】

     

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    阅读理解。
          
         Maybe your math teacher has already taught you how to find the center of a circle. It is not easy to
     learn and it takes some time to do so. Here is a way. First put a corner of a square piece of paper on a
     given circle and you will see the two sides the piece of paper meet the circle. And then you will get two
     points on the circle. You may name them Point A and Point B. Now draw a straight line through the Point
     A and Point B. You can get Line AB. Then, you must do the same thing a second time in a different place
      to get another two points, Point C, Point D and Line CD. You must write them down on the paper by
     yourself. You will find the center at once: the two lines cross at a point you may call it point O and this
     point is just the center of the circle. How about trying to see if it is easy to learn and remember this
     simple way of finding the center of a circle?
    1. How many points are mentioned in the passage?
        A. Three      
        B. Five      
        C. Four
    2. Which point is the center of the given circle?
        A. Point O        
        B. Point B      
        C. Point A
    3. Does the center run through Line AB or Line CD?
        A. Line CD      
        B. Neither      
        C. Both
    4. Which of the following is the right order to find the center of a given circle?
       a. Draw a straight line through the two points A and B.
       b. Do the same thing again in a different place.
       c. The two lines cross each other at a point.
       d. Put the corner of the square piece of paper on the given circle.
        A. a, b, c, d      
        B. c, a, b, d      
        C. d, a, b, c
    5. When you use this way to find the center of a given circle, you need _____.
       A. a pencil, a square piece of paper and a pair of compasses
       B. a pair of compasses, a ruler and a square piece of paper
       C. a ruler, a pencil and a square piece of paper

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