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21. Do you agree or disagree with the following statement? In the past people ate food that was better for their health than they do today. Use specific reasons and examples to support your answer.练习人数： 0
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22.练习人数： 737
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23.练习人数： 575
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24.练习人数： 237
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25.练习人数： 175
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26.练习人数： 139
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27.练习人数： 271
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28.练习人数： 88
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29.练习人数： 176
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30.练习人数： 74
