题目内容
要实现热能与机械能的转换需通过()的变化才能完成。
查看答案
搜索结果不匹配？点我反馈
更多问题
Which of the following is true of the text？
A．Nineteen million dollars.B．Thirty- two million dollars.C．Thirty-seven million dollar
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
听力原文： The dog has often been an unselfish friend to man. It is always grateful to its master. It helps man in many ways. Certain breeds of dogs are used in criminal investigations. They are trained to sniff out drugs and bombs. They help police to catch criminals. Some dogs are trained to lead blind people.
The dogs that help in criminal investigations are trained at a school called the Military Dog Studies branch of the US Air Force in Lackland, Texas, The dogs to be trained are selected by an air force team. This team visits large cities across the country to buy the dogs. They may buy dogs from private citizens for up to $750 each. Some citizens freely give their dogs. The dogs selected must be healthy, brave and aggressive. They must be able to fight back if they are attacked. The dogs chosen are between the ages of one and three. They are given a medical examination when they arrive at the school. Their physical examination includes X-rays and heart tests. The trainee dogs undergo the first stage of training when they arrive in Lackland. This is an 11-week course for patrol duty. After this course, the best dogs are selected to go on another 9-week course. They learn drag-sniffing or bomb-sniffing. After this course, the dogs axe ready for their jobs in the cities or on air force bases.
The training given to a drag-sniffing dog is different from that given to a bomb-sniffing dog. A drag-sniffing dog is trained to scratch and dig for the drugs when he sniffs them. A bomb-sniffing dog sits down when he finds a bomb. That is the alert for hidden explosives.
(27)
听力原文：W: Next patient, please! Come in.
M: Morning, doctor. Sorry I'm a bit late, but I felt really awful when I got up.
W: Don't worry. It's Mr. Barnes, isn't it？
M: That's right.
W: Is that B-A-R-N-E-S？
M: Yes, it is.
W: Right, now what seems to be the trouble？
M: Well, I've had this awful flu and a terrible cough.
W: I see. How long have you been feeling like this？
M: Oh, about three or four days, I suppose.
W: And have you been taking any medication？
M: Just the normal things, Aspirins, lemon and hot drinks, but it hasn't done any good.
W: Are you a smoker？
M: No. I gave up three years ago.
W: Have you had a temperature？
M: Yes. For the last couple of days or so.
W: OK. I'll just take a look at your chest. Take off your pullover and jacket please....Right. Now breathe in...and out slowly, And a gain. Good, Once more. That's it. Pop your clothes back on.
M: Thank you.
W: Well, it looks as if you've got a touch of bronchitis. I'll give you some cough mixture and a prescription for a course of antibiotics as well. Take one capsule every 8 hours for the next five days.
M: OK, Doctor, What about going to work？
W: No, You'll have to spend a couple of days in bed till it clears up.
(23)
微信支付 
支付宝支付