Have you ever seen a rainbow(彩虹) in the sky? Do you know  36   it is?

A story says that when you see a rainbow you should  37  at once to the place where it touches the ground,  38  there you would find a bag of gold. Of course, it is not  39  . You could not find the bag of gold, nor could you ever find its end. No matter how  40   you run, it always seems far away.

A rainbow is not a thing  41  we can feel with our hands . We know it is only the effect (效果) of light shining on raindrops(雨滴). It is called a rainbow perhaps because it is  42   raindrops and looks  43  a bow (弓).

That is why we can never see a rainbow in a clear  44  . Every rainbow has many colors in the same  45  . The first of the top color is always red and the last is blue. A rainbow is indeed one of the wonders of nature.

36.(  ) A. how       B. what          C. where        D. when

37.(  ) A. run      B. walk         C. jump         D. fly

38.(  ) A. and       B. so            C. in               D. at

39.(  ) A. good      B. wrong        C. true          D. bad

40.(  ) A. long      B. short       C. fast          D. far

41.(  ) A. what      B. who          C. whom         D. which

42.(  ) A. made of    B. made from     C. make up of      D. made by  

43.(  ) A. like      B. at          C. for      D. after    

44.(  ) A. space    B. sky         C. fields            D. sea

45.(  ) A. line      B. row         C. order      D. group

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