题目内容

设一组初始记录关键字序列为(15，17，18，22，35，51，60)，成功查找时的平均查找长度。

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试用伯努利方程分析并解释足球运动中的香蕉球和飞机在空气中飞行时机翼所受的升力？

A. Short dialoguesChoose the best answer to the questions you hear.1.A. He worked too hard in his garden.B. He didn’t sleep well.C. He is not in a good mood.D. He had to look after a cat.2.A. Hamburger.B. Hot dog.C. Instant noodles.D. Crisps.3.A. She has a headache.B. Her forehead gets hurt.C. She has a fever.D. She thinks the weather is hot.4.A. Mosquitoes.B. Sharks.C. Snakes.D. Tigers.5.A. Good mood.B. Hard work.C. Healthy food.D. Daily exercise.[音频]

B. Short conversationChoose the best answer according to what you have heard.1.A. He has a headache.B. He has a toothache.C. He has a stomachache.D. He has a temperature.2.A. At 8:30.B. At 9:13.C. At 8:13.D. At 9:00.3.A. Breakfast.B. Lunch.C. Afternoon tea.D. Supper.4.A. 2.B. 3.C. 4.D. 6.5.A. He likes sleeping.B. He works hard.C. He doesn’t like eating.D. He doesn’t like doctors.[音频]

C. DictationFill in the blanks in the following passage according to what you have just heard.Breakfast is not only the most important meal of the day, it is also the most neglected or skipped. Breakfast simply (1) _ “break the fast (禁食)”. Your body spends at least 6 to 12 hours each night in a fasting state. In the morning your body (2) _____ energy for the day’s work ahead. If you skip breakfast, you may find it (3) _ to work effectively in the late morning. When you choose not to eat breakfast, your body stays in a (4) _ state. Also, people who skip breakfast often eat much at other meals, since a fall in blood sugar makes you feel extremely hungry later. By contrast, breakfast-eaters tend to eat (5) ______ fat during the day, have more strength and better concentration. So why not eat breakfast?[音频]