改错题
Directions: The following passage contains 10 errors. Each indicated line contains a maximum of ONE error. In each case, only ONE word is involved. You should proofread the passage and correct it. Please write your answers on the Answer Sheet.
填空题
（41）________
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（42）________
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（43）________
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（44）________
填空题
（45）________
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（46）________
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（47）________
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（48）________
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（49）________
填空题
（50）________