单选题After a busy day of work and play, the body needs to rest. Sleep is necessary for good health. During this time, the body recovers from the activities of the previous day. The rest that you get while sleeping enables your body to prepare itself for the next day. There are four levels of sleep, each being a little deeper than the one before. As you sleep, your muscles relax little by little. Your heart beats more slowly, and your brain slows down. After you reach the fourth level, your body shifts back and forth from one level of sleep to the other. Although your mind slows down, from time to time you will dream. Scientists who study sleep state that when dreaming occurs, your eyeballs begin to move more quickly (although your eyelids are closed). This stage of sleep is called REM, which stands for Rapid Eye Movement. If you have trouble falling asleep, some people recommend breathing very deeply. Other people believe that drinking warm milk will help make you drowsy. There is also an old suggestion that counting sheep will put you to sleep!

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单选题听下面一段对话，回答第22至第25题。

单选题You will hear four dialogues or monologues. Before listening to each one, you will have 5 seconds to read each of the questions which accompany it. While listening, answer each question by choosing A, B, C or D. After listening ,you will have 10 seconds to check your answer to each question. You will hear each piece ONLY ONCE. Questions 11～13 are based on the following dialogue between two passengers.

单选题Has your brother found a job______? A. yet B. already C. still

单选题Whatarethetwospeakerstalkingabout?A.Howtoarrangeforatrip.B.Howtobookasatisfactoryroom.C.Whentheshopwillbeclosed.D.Whattheweatherislike.

单选题{{B}}Part A{{/B}}{{I}} You will hear 10 short dialogues. For each dialogue, there is one question and four possible answers. Choose the correct answer--A, B, C or D, and mark it in your test booklet. You will have 15 seconds to answer the question and you will hear each dialogue ONLY ONCE.Now look at Question 1.{{/I}}

单选题Sleep is a funny thing because ______.

单选题Whydidn'tthemanseethedoctorearlier?A.Hisinjurykepthimathome.B.Hewastooweaktoseethedoctor.C.Hedidn'tthinkitnecessary.D.Hefailedtomakeanappointment.

单选题A webcam is a digital camera that sends video images to other computer users. It's about the (26) of a golf ball and typically (27) on top of your computer monitor. Once the webcam is (28) to the USB port of your computer with the necessary software, (29) images of you can be sent to one or more users over the Internet (30) an instant messaging(IM) service. A webcam costs about $50. More expensive models come with added (31) , such as better picture resolution. Two leading makers, Logitech and Creative, offer a range of models, (32) software is included. There is no extra Internet (33) to send or receive video images, though you'll have to (34) for a free instant messaging service. Everyone can see and hear one another in (35) time. Grandparents can see their grandkids more (36) . Webcams can work with almost any computer bought in the past five years and can (37) long-distance phone bills. (38) you have broadband, that is, a high-speed cable-modem or DSL connection, images may (39) a long time to download, (40) a slide show rather than a movie. While webcams are easy to link to your computer, learning to (41) the software can take time. You have to make some rearrangement with the configurations. (42) you have a 56k modem and the people you want to (43) won't mind seeing live shots instead of perfect video, a webcam is still fun. (44) before you buy, be sure everyone (45) for the same IM service.

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