Unit 5 Canada-The True North reading课时作业

阅读理解(共15小题；每小题2分，满分30分)

　　阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。

　　It's true that teens don't get enough sleep，but changing the school starting time would have a chaotic effect and throw everyone off balance.

　　Scientists have shown that teens are more active later at night than children and adults, so most teens are probably staying up late for whatever reasons. "The researchers measured the presence of the sleep－promoting hormone (荷尔蒙) in teenagers' saliva (唾液) at different time of the day." They learned that the hormone levels rise later at night than they do in children and adults-and remain at a higher level later in the morning. Measuring the hormone in the saliva is a good way to show that most teens have sleep problems, but changing school schedules isn't the best way to fix this. Most people arguing against changing school schedules would say that it would only cause teens to stay up and wake up later, thus leaving them with the same problem.

　　The biggest problem schools would come across from changing their schedules would be the after－school sports and job conflicts students and teachers would meet. "Teachers reported that students were more alert, and research showed that after－school sports and jobs would suffer." Students in that area might have been able to deal with less time for jobs and sports somehow, but some of them have practice and earlier plans that would become conflicted if this change were to occur. Most students rarely have time to play a sport and do homework before 9 or 10 o'clock. Opening schools later may have worked for some areas, but the reality is often very different.

　　1．The meaning of the underlined word "chaotic" in the first paragraph is close to "________"．

　　A．positive B．apparent

　　C．negative D．absurd

答案与解析：C　词义猜测题。根据文章第二段最后两句以及第三段首句的内容可知，改变学校的上课时间会产生负面影响，故此处chaotic意思同negative。