_长沙成考网

What can be learned from the study?

• A、Cats take food no matter who feeds them.

• B、Cats refuse food from unhelpful strangers.

• C、Dogs refuse food from those who anger them.

• D、Dogs take food no matter how they are treate

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。

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.