8．What does the writer want to tell us by taking mice for example?

　　A．Young mice try to look for safety.

　　B．Mice experience different stages.

　　C．Young mice like to stay with their mothers.

　　D．Mice also experience a period to explore the world.

　　解析：选D　写作意图题。根据第四段中的“teens everywhere go through this exploratory period ... during their development”可知，文中提到老鼠的例子是为了说明即使老鼠也会像人一样经历探索的时期。故答案选D。

　　9．According to the text, the teenager who explores most will ________.

　　A．make few mistakes in his life

　　B．have advantages over others

　　C．lose his confidence and even his life

　　D．experience no failure and live longest

　　解析：选B　细节理解题。根据最后一段第二句“She and other researchers are showing ...”可知，在青少年时期对世界探索最多的人会比别人有优势。故答案选B。

　　10．What may the text discuss in the next part?

　　A．How a teenager can make right choices.

　　B．What really goes on in the teenage brain.

　　C．What has been discovered in the lab experiment.

　　D．Why the parents shouldn't allow teenagers to smoke.

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