Section B 1d答案
Section B 2b答案
Exercise：15%：every day
45%：4-6times a week
20%：1-3times a week
20%：no exercise
Use the Internet：90%：every day
10%：3-4 times a week
Watch TV:85%：every day
13%：4-6 times a week
2%：1-3 times a week
Section B 2c答案
1.20%
2.90%.
3.Every day.Game shows.
4.Exercise.It is healthy for the mind and the body.
Section B 2d答案
2. Eighty-five percent of the students always watch TV.
3. Forty-five percent of the students usually exercise.
4. Ten percent of the students someties use the Internet.
5. Thirteen percent of the students usually watch TV.
6. Two percent of the students somnetimes watch TV.
Section B 3a答案
every day，often，hardly，usually，sometimes，hardly，never
Self Check第3题答案
sometimes，How often，Hardly，How often，every，always
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