48. Which of the following would the author probably NOT consider serious walking?
(A) Walking 20 minutes a day.
(B) Walking just before jogging.
(C) Increasing your speed little by little.
(D) Walking while window shopping.
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統計: A(6), B(27), C(8), D(154), E(0) #706358
統計: A(6), B(27), C(8), D(154), E(0) #706358