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21. The university has provided student who are going to enter university with two summer vocation grograms. Which one do you think is better for students? 1) take some college courses in advance. e.g. some courses that are related to students major. 2) visit some history museums or historical relics.练习人数： 0
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22.练习人数： 175
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23.练习人数： 139
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24.练习人数： 271
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25.练习人数： 88
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26.练习人数： 176
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27.练习人数： 74
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28.练习人数： 23
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29.练习人数： 54
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30.练习人数： 131
