这篇资料是关于山东省临沭县曹庄镇中心中学八年级英语上册Unit2《How often do you exercise》的练习内容，主要涉及英语词汇、短语和句子的掌握。以下是相关知识点的详细说明：
1. 词汇与短语：
- 帮着做家务：help with housework
- 去看电影：go to the movies
- 一周三次：three times a week
- 用电脑：use a computer
- 空闲的：free
- 忙于做某事：be busy with sth.
- 熬夜：stay up late
- 至少：at least
- 想要某人做某事：want sb. to do sth.
- 对…有好处：be good for
- 询问某人某事：ask sb. about sth.
- …的结果：the result of…
- 一点也不：not...at all
- 对…感到吃惊：be surprised at
- …的答案：the answer to...
- 做某事最好的方式：the best way to do sth.
- 一个16岁的女孩：a 16-year-old girl
- 多于：more than
- 少于：less than
- 旧习难改：old habits die hard
- 去看牙医：go to the dentist
- 和某人一起度过时光：spend time with sb.
2. 句型示例：
- ---What do they do on weekends? ---- They often help with housework.
- Next week is quite busy for me.
- What kind of dance are you learning?
- He plays soccer at least twice a week.
- My mother wants me to drink more milk.
- She says it is good for my health.
- How many hours do you sleep every night?
- We asked the students about their free time activities.
- Twenty percent students do no exercise at all.
- The answers to the questions were interesting.
- It's a good way to relax by using the Internet.
- The best way to really relax is through exercise.
- She never goes to the dentist.
3. 单选题解析：
- 第一题：尽管妈妈让我关门，但我忘了。正确答案为D. Although；/，"although"引导让步状语从句，不与"but"连用。
- 第二题：保持健康，但身体状况不好。正确答案为C. healthy；health，形容词"healthy"修饰动词"keep"，名词"health"在介词"in"后。
- 第三题：你认为最好的放松方式是通过运动吗？正确答案为B. through，表示方式。
- 第四题：你多久跳舞一次？—我一周跳一次或两次。正确答案为D. once or twice，表示频率。
以上内容涵盖了本单元的重要词汇、短语以及相关句子结构，对于学生理解和掌握本单元的英语知识非常有帮助。
