D．Giving attention to all those in attendance.

　　解析：题干中“rule of politeness”为“藤”通过寻读在原文中找到这根“藤”broke an important rule of politeness.顺着这根“藤”往下就可以找到“瓜”——I ignored everyone else and talked four hours to the botanist.此信息与选项中D的说法恰恰相反结合前句中的broke可知作者描述的礼貌规则是“关注所有参与的人”正确。答案：D to between 9 am and 9 pm...just to make sure he's not putting on too much puppy fat.

　　Why has Nat decided to limit the feeding machine's operating time?

　　A．He doesn't want Toby to get too fat.

　　B．He fears the machine will run out of food.

　　C．He wants his friends to stop feeding Toby.

　　D．He doesn't want Toby to be woken up at night.

　　解析：题干中的“limit the feeding time”为“藤”通过寻读在原文中找到这个“藤”restrict feeding time然后顺着这根“藤”往下就可以找到“瓜”——to make sure he's not putting on too much puppy fat此信息与选项中A的说法相一致。答案：Aen up when they started to dream.

　　B．Half of them were asked to dream about the maze.

　　C．All of them were asked to describe their thoughts.

　　D．Half of them were asked to sleep for 90 minutes.

　　解析：题干中的“break为“藤”通过寻读在原文中找到这个“藤”break...participants然后顺着这根“藤”往下就可以找到“瓜”——half were asked to sleep此信息与选项中D的说法相一致。答案：D off，with a commitment to academic excellence and public service.

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