【分析】本句中的so表示上下文之间的因果关系，是一个并列连词。句中的for instance是一个插入语，过去分词短语controlled by your toothbrush在句中充当定语修饰前面的名词a game，这主要是因为动词control与game之间构成被动关系。

2. He would come home from work and ask his kids if they had brushed their teeth.

【翻译】他下班回家以后经常会问他的孩子是否已经刷牙了。

【分析】本句中的情态动词would表示过去常常做某事，would表示过去常常做，现在可能还在做；而used to do sth表示过去常常做，现在不做了。另外句中的宾语从句if they had brushed their teeth中的if表示"是否"，而不是"如果"。

　　With around 100 students scheduled to be in that 9 am Monday morning lecture, it is no surprise that almost 20 people actually make it to the class and only 10 of them arc still awake after the first IS minutes; it is not even a surprise that most of them are still in their pyjamas (睡衣). Obviously, students are terrible at adjusting their sleep cycles to their daily schedule.

　　All human beings possess a body clock. Along with other alerting (警报) systems, this governs the sleep/wake cycle and is therefore one of the main processes which govern sleep behaviour. Typically, the preferred sleep/wake cycle is delayed in adolescents, which leads to many students not feeling sleepy until much later in the evenings. This typical sleep pattern is usually referred to as the "night owl" schedule of

　　This is opposed to the "early bird" schedule, and is a kind of disorder where the individual tends to stay up much past midnight. Such a person has great difficulty in waking up in the mornings. Research suggests that night owls feel most alert and function best in the evenings and at night. Research findings have shown that about 20 percent of people can be classified as "night owls" and only 10 percent can be classified as "early birds" - the other 70 percent are in the middle. Although this is clearly not true for all students, for the ones who are true night owls this gives them an excellent excuse for missing their lectures which unfortunately fall before midday.

7. What docs the author stress in Paragraph I?

A. Many students are absent from class.

B. Students are very tired on Monday mornings.

C. Students do not adjust their sleep patterns well.

D. Students are not well prepared for class on Mondays.