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How does exercise sharpen the mind according to Para.2?

• A、By increasing the brain siz

• B、By decreasing the protein level.

• C、By extending the time of concentration.

• D、By strengthening brain cells’ connections.

Which of the following is closest in meaning to “sitting on the sidelines” in Para. 3?

• A、Not being notice

• B、Expressing vague ideas.

• C、Not being involve

• D、Following what others do.

Writing: For this part, you are supposed to write an e-mail in about 100 - 120 words based on the following situation. Remember to write it clearly.

你(Li Yuan)下周一因为要去参加演讲比赛，不能上外教(Prof.Smith)的写作课。请给他写一封e-mail，内容包括:

·请假并表示歉意；

·解释不能上课的原因，如比赛的重要性；

·承诺会自学所缺内容并按时交作业；

·祝他偷快。