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The purpose of the wearing rings used in a centrifugal pump is to （）.
A . prevent an internal explosion in the pump when it is overheated
B . enable a visual inspection of the pump while it is running
C . insure a proper alignment of the pump coupling to the driver
D . accommodate for friction between the impeller and the easing
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飞机陆地完全停稳至获得撤离信息指挥口令:不要惊慌,听我指挥！Don’t panic!Follow me！解开安全带！不要带行李！脱下鞋！Open seat belt!No baggage!No shoes! （）
A . 正确
B . 错误
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What is a function of the wearing rings used in most centrifugal pumps?（）
A . Absorb erosion of high velocity discharge stream
B . Seal pump shaft against entry of air
C . Isolate the discharge side from the suction side
D . Dampen the turbulent discharge flow
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FASTEN SEAT BELT灯不受下列何设备控制（）
A . 旅客标记控制电门
B . 后缘襟翼限制电门
C . 起落架手柄电门
D . 呼叫复位电门
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飞机陆地完全停稳至获得撤离信息指挥口令:不要惊慌,听我指挥！Don’t panic!Follow me！解开安全带！不要带行李！脱下高跟鞋！Open seat belt!No baggage!No high-heeled shoes! （）
A . 正确
B . 错误
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If you were operating a centrifugal water service pump with worn wearing rings, the （）.
A . pump would be very noisy
B . pump would vibrate excessively
C . pump would develop insufficient flow
D . stuffing box would leak excessively
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Can a belt make arobe look nice according to the passage?
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Does Busigei meana woman wearing a robe without a belt?
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原文:
But it will be the driver’s responsibility to make sure that children under 14 do not ride in the front unless they are wearing a seat belt of some kind.译文 :但是司机有责任确保14岁以下的孩子不要坐在前排,______他们系好了安全带。_
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Can a belt make a robe look nice according to the passage?
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When the airplane takes off ， the passengers are told to _______ their seat belts.
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According to the text, which of the following people riding in the front do nothave to wear a seat belt ？ ()
A．Someone who is backing into a parking space.
B．Someone who is picking up the children from the local school.
C．Someone who is delivering invitation letters.
D．Someone who is under 14.
此题为多项选择题。
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The air hostess (空中小姐) _____ the passengers to fasten their seat belts when the plane was about to land._
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听力原文：M: Hi, Margaret, where were you at dinner-time？ I was saving a seat for you in the coffee shop.
W: Oh, sorry to miss you. But my thirst for knowledge was greater than my pains of hunger.
M: So where were you？
W: My physical science class ran overtime. Actually, what happens is that some of us hang around for a while after class to talk with our professor and ask him questions.
M: Who is this 21st century's Newton？
W: Professor Greg, have you heard of him？
M: Yes. He does have a good reputation in the Physical Science Department.
W: And a well deserved one. The same students who Pall asleep in discussion group fight for front-row seats in his lectures.
M: Oh, on. I hope this isn't amazing.
W: You can joke. But it's great to have a professor who's not only interesting but prepares to give up time to students.
M: I know it is really rare. Maybe I should sit in his class some time. Do you think he'd care？
W: Not at all. Lots of students bring their friends. He says he feels flattered.
M: Well, just to be safe, I think I'll bring my dinner along as well.
W: I'll make a good student of you yet.
(20)
A．In the coffee shop.
B．Discussing physical problem in the classroom.
C．Working on a science problem at home.
D．Reading 20th century literature in the hbrary.
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Wearing a seat belt saves lives; it reduces your chance of death or serious injuries by more than half.
A)在这次事故中，没有穿上救生衣的人死伤已过半。
B)系安全带能挽救生命，可使死亡或严重受伤的机率减少一半以上。
C)在这次事故中，穿上救生衣的人多半避免了死伤。
D)穿救生衣可挽救生命，多半也会减少死亡或者受重伤的机会。
E)系安全带能挽救生命，可使死亡或严重受伤的可能性减少一半。
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Everyone aboard the plane is ____the seat belt.A．should wear
B．supposed to wear
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is one way to prevent（防止) the strong sunshine in Bangkok.A．Wearing a hatB．Staying in the
is one way to prevent(防止) the strong sunshine in Bangkok.
A．Wearing a hat
B．Staying in the forests
C．Climbing up the mountains
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听力原文：W: Were you able to book seats for this coming Tuesday？ The urgency of the trip means that we don't have much time.
M: Yes, but business and economy classes were full I had to upgrade to first.
Q: What are the man and woman discussing？
(17)
A．Enrolling in a business class.
B．Airline reservations.
C．Concert tickets.
D．An important meeting.
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听力原文：M: It's so cold now, but this morning it was so hot and sunny. I wish there was a way! could always be wearing the most suitable clothes for the temperature.
W: I recently read that in ten years we'll be wearing clothes that change with the weather. So when it's cold, our clothes will warm up, and when it's hot, our clothes will cool off.
M: Oh, very funny! So we'll be wearing huge clothes with built-in air conditioners and heaters.
W: I'm being serious! Researchers have discovered a method of treating fibers with plastic crystals capable of storing and releasing heat as the temperature fluctuates. These treated fibers absorb more heat than untreated fibers. Researchers are still working with this, but soon this process will be widespread.
M: That's fascinating. I didn't know that fibers had the capability of storing heat. How does that work？
W: These fibers work with the heat by rearranging their structures. The treated fibers move back and forth between two solid shapes.
M: I don't understand. What kind of shapes do they change into？
W: When the weather gets warmer, the crystals take on cube shapes and absorb heat. When the weather gets cooler, the crystals become cooler and come back to their original structure.
M: That's truly unbelievable. You said that it'd be a decade before this type of clothes will be available, What a shame! I don't think I can wait that long.
(23)
A．He is indifferent.
B．He is doubtful.
C．He is disgusted.
D．He is alarmed.
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听力原文：M: Have you heard that in another few years you may be able to buy a car that changes colors every day to match the outfit you are wearing？
W: Oh, please be serious! I suppose they will change shapes as well. If you want a big car to take all your friends camping, I suppose you'll just be able to snap your fingers and make it happen. Or if you want a sporty two-seater, you could just tell the car what you wanted, and it would do the rest. Is that how it will work？
M: No, I am serious. They have found a way to alter the surface of metals so that they can reflect different colors just by passing a small amount of electricity over them.
W: Oh, I see. So anything that touches the outside of the car will get a shock. That sounds lovely.
M: It's only a tiny amount of electricity. It wouldn't be enough to shock anybody.
W: Well, it sounds pretty difficult to believe.
M: Yes, it's quite amazing. The important thing you have to remember is that the color of an object is really just an illusion created by the way light bounces off its surface. Engineers have been able to produce a car that changes colors at the touch of a button by slightly rearranging the position of the particles on the surface of the metal.
W: It sounds so amazing. But I guess it could be possible.
M: It is possible today. The only problem is that it is very expensive. To produce a car with a surface that changed colors would cost almost twice as much as what a regular car costs. For that much money you could just by the car and have it repainted twenty times, so it's not very practical yet.
W: Yes, but in other ways it could be more practical. If you took your car to be painted twenty times, it would use quite a bit of polluting chemicals, and it would take a long time.
M: You're right there, but how many people really get their car repainted that many time？
W: Hmm, I suppose you're right, but I sure would love to have my car match my outfit every day.
(26)
A．She is impressed.
B．She is doubtful.
C．She is shocked.
D．She is surprised.
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The captain asked the passengers to remain seated and keep their seal belts （).
A．fast
B．tight
C．fastened
D．tense
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When may two persons share on approved safety belt in a lounge seat？
A、When one is an adult and one is a child under 3 years of age.
B、Only during the en route flight.
C、During all operations except the takeoff and landing portion of a flight.
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She （)her diamond earrings by wearing her hair in a bun.
A.flaunt
B.flout
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安全带是seat belt 吗？
