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阅读理解。

     Long long ago, a donkey(驴)  fell  into a well(井). The animal cried for hours as the farmer tried to

think out what to do.   Finally,   the farmer thought  the  animal was too old and the  well needed to be

covered up anyway, so he decided not to save the donkey.

     The farmer  invited  his neighbours  to help him.   They began  to  shovel(铲)  dirt into the well. The

donkey cried harder.   But a  few minutes later, he became quiet. The farmer looked into the well, and

was surprised by what he saw.

     While every shovelful of dirt hit his back, the donkey  would shake it off and take a step on the new

layer of dirt. As the farmer's neighbours continued to shovel dirt on top of the animal, the donkey would

shake it off and take another step up. Soon the donkey stepped up  out of the well and ran away, to the

surprise of all the neighbours.

     The lesson we get from this story is that if life  shovels  some dirt on us, we must get out the well and

not let it cover us. We must learn to shake it off and take a step up. Each of our troubles is a

stepping-stone(踏脚石). We can get out of the deepest well by never giving up!

1. The farmer is ________________.               

A. careless  

B. kind to the donkey  

C. read to give up the donkey    

D. friendly

2. When we are in trouble, we have to learn from _______ in the story.

A. the farmer  

B. the neighbours  

C. the donkey      

D. all of them

3. the story tells us _____________.

A.never to give up even if we're in great trouble

B.the donkey is a clever animal

C.the man has to be kind to the animal

D.the man is the most cruel(残酷的) animal

假设月亮和同步卫星都是绕地心做匀速圆周运动的，下列说法正确的是（　　）

A．同步卫星的线速度大于月亮的线速度

B．同步卫星的角速度大于月亮的角速度

C．同步卫星的向心加速度大于月亮的向心加速度

D．同步卫星的轨道半径大于月亮的轨道半径

以下哪些故障适用于第一级安全稳定标准（）。

A.线路单相瞬时故障重合成功

B.直流输电线路单极故障

C.同杆并架双回线异名两相同时发生单相永久故障重合不成功，双回线同时三相跳开

D.母线故障

在充分竞争的市场上，引起商品价格变化的基本因素是( )

A．供给

B．需求

C．供求变化

D．消费