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11. If people want to contribute to the society, which of the following is the best way? 1. riding bicycle or walking on foot 2. recycling the waste 3. buying local organic food练习人数： 131
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12.练习人数： 94
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13.练习人数： 82
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14.练习人数： 47
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15.练习人数： 108
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16.练习人数： 56
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17.练习人数： 20
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18.练习人数： 59
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19.练习人数： 20
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20.练习人数： 34
