50. A. don't know B. didn't know C. knew D. know
51. A. looked for B. discovered C. found D. invented
52. A. by B. out C. up D. with
53. A. use B. with C. on D. by
54. A. or a B. and a C. and D. or
55. A. at last B. at the beginning C. at the end D. at first
习题答案请见:中考英语阅读真题每日一练(1-20)答案
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