预习Unit 1  How often do you exercise? 你多久锻炼一次？

教学过程：
一. 知识与技能：
词汇：
    hardly, ever, twice, once, time, Internet, program, result, junk, milk, health, interviewer, habit, difference, grade, lifestyle, unhealthy, yuck, although

句型及日常交际用语
  1. －What do you usually do on weekends?
    －I usually play soccer.
  2. －What do they usually do on weekends?
    －They often go to the movies.
  3. －What does he / she do on weekends?
    －He / She sometimes watches TV.
  4. －How often do you play tennis?
    －I play once a month.

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