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1, Why do you think some activities like walking, gardening, aerobics, swimming, cycling, running...use more calories than others?

Because we need more effort and energy to do these activities.

2, Which activity uses more calories: gardening or walking?

Gardening

3, How many calories do you use doing aerobics for 2 hours?

About 660 calories.

4, What do you think happens when we have too few calories, but use too many calories?

We will be tired and weak

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