摘要： I've talked a lot about walking. I want to say it is a cheap ,safe and enjoyable form of exercise, and it's environmentally friendly. A. in all B. in conclusion C. in other words D. in addition
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I’ve talked a lot about walking. , I want to say it is a cheap, safe and enjoyable form of exercise.
A. In detail B. In conclusion C. In effect D. In reality
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