20．What's the subjective reason for being hard to break bad behaviors?

　　A．Some behaviors get deep­rooted in our brains.

　　B．We prefer an immediate reward.

　　C．We value delayed gifts.

　　D．We are all creatures of nature.

　　21．What does the underlined word “connection” in Paragraph 3 refer to?

　　A．Pleasure and behavior.

　　　B．Brain and reward.　D．Cue and environment.，________e

　　D．the more you'll want to get a reward

　　23．Why does Volkow eat popcorn even though he doesn't like it?

　　A．Because he recognizes the importance of him.

　　B．Because it is needed for normal growth of the body.

　　C．Because he can't resist the temptation of it.

　　D．Because it makes him relaxed to eat popcorn while seeing films.

　　Ⅲ.书面表达一个英国中学生代表团将到你校参观和交流， 假设你有幸参加与他们的座谈会，请根据以下图示，写一篇120词左右的发言稿，请你谈谈学校开展小组合作学习和自主学习的体会。

　　注意：1.根据图片的内容适当展开，2．开头已给出，不计入总词数；文中不能出现考生的具体信息。 It's my pleasure to briefly introduce my school life regarding two aspects, independent learning and cooperative learning.

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