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21. Imagine that a professor requires students to learn as much as possible about a subject in a short period of life. Is it better for the professor to require students to work together in a group or is it better to require students to work alone?练习人数： 24
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22.练习人数： 26
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23.练习人数： 25
-
24.练习人数： 24
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25.练习人数： 29
-
26.练习人数： 19
-
27.练习人数： 13
-
28.练习人数： 39
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29.练习人数： 8
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30.练习人数： 9
