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21. The university will spend money on dormitory to improve the life quality of students, which of the following do you think is the best way? 1.providing a room for quiet study; 2.building an exercise room; 3.providing entertainment place(watch film)练习人数： 29
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22.练习人数： 19
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23.练习人数： 13
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24.练习人数： 39
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25.练习人数： 1
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26.练习人数： 8
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27.练习人数： 26
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28.练习人数： 7
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29.练习人数： 9
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30.练习人数： 31
