涡轮喷气发动机主要由哪几部分构成？各部分的主要功用是什么？

阅读理解。

    Every year thousands of people get hurt or die when they are crossing the road. Most of these people

are old people and children. Old people often get hurt or die because they can't see or hear very well.

Children usually meet with accidents because of their carelessness. They forgot to look and listen before

they cross the road.

    How can we lessen (减少) traffic accidents? All of us must obey the traffic rules. For the drivers,

they shouldn't drive too fast. If they drive too fast, it will be very difficult to stop the cars in a very short

time. For the pedestrians (行人), it's very important to be careful when they are walking on the road.

Therefore, when we walk across the road, we must try to walk along the pavements. We must stop and

look both ways before crossing the road. Look left first, next look right, then look left again. Only when

we are sure that the road is clear, we can cross it. The right way to cross the road is to walk quickly. It's

not safe to run. If people run across the road, they may fall down. Teens should try to help children, old

people or blind people to cross the road, and never play in the street.

1. Which of the following is NOT the right way to cross the road? [ ]

A. Stop and look both ways.

B. Run quickly.

C. Make sure that the road is clear.

D. Walk quickly.

2. Why do most old people often get hurt or die when they are crossing the road? [ ]

A. Because they can't see or hear very well.

B. Because they forget to look and listen.

C. Because they are not careful.

D. Because they often run across the road.

3. The best title for this article may be           . [ ]

A. How to lessen traffic accidents?

B. How to cross the road?

C. Please obey the traffic rules.

D. Meeting with traffic accidents.

4. As a student, you can            to try to lessen traffic accidents. [ ]

A. let drivers drive slowly

B. play in the street carefully

C. help children to cross the road

D. run across the road quickly

酸中毒的病人血K浓度增加的原因是（）。

A.尿量减少致排K⁺减少

B.肾脏H⁺-Na⁺交换增多，K⁺-Na⁺交换减少

C.红细胞破坏较多，K⁺释出较多

D.醛固酮分泌减少使排K⁺减少

E.抗利尿激素分泌减少

明代的儿科推拿文献包括（）

A.《小儿推拿活婴全书》

B.《幼科百效全书》

C.《小儿推拿仙术秘诀》

D.《小儿按摩经》

E.《动功按摩秘诀》

在电路中熔断器是起短路保护作用。

帧同步码10011011与1011相比，（）。

A.传输效率低

B.捕获时间短

C.伪同步的可能性越大

D.以上都错误