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11. Which one is the most important factor to help you work productively: A. Having an environment free of noise and distractions; B. Knowing that you will receive a reward; C. Doing something you are interested in.练习人数： 34
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12.练习人数： 82
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13.练习人数： 20
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14.练习人数： 18
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15.练习人数： 82
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16.练习人数： 63
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17.练习人数： 7
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18.练习人数： 7
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19.练习人数： 737
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20.练习人数： 575
