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21. Which one is the most important for teacher of high school? The ability to help students plan for their future; the ability to find the student who need the most help and to give that help; or the ability to encourage students to learn on their own outside of the classroom.练习人数： 14
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22.练习人数： 0
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23.练习人数： 2
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24.练习人数： 8
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25.练习人数： 6
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26.练习人数： 24
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27.练习人数： 12
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28.练习人数： 26
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29.练习人数： 10
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30.练习人数： 1
