4,英语37-52
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37-42. E B A G F C
43-47. electronic; living; invented; calculation; inventions
48. Don't close
49. Does; have
50. first book
51. It; walk
52. One of the first calculating machines was an abacus.
43-47. electronic; living; invented; calculation; inventions
48. Don't close
49. Does; have
50. first book
51. It; walk
52. One of the first calculating machines was an abacus.
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