某温度下，甲、乙两个烧杯中各盛有100g相同浓度的KCl溶液，现将甲烧杯中的溶液

产生肺泡回缩压力的因素是（）

A．胸内负压

B．肺泡表面活性物质

C．肺的弹力纤维

D．呼吸膜内层液面的表面张力

Li Ming and I                going to watch a movie.[ ]

A. are       

B. am       

C. do      

D. did

将一个2毫米的零件画在图纸上长10厘米，这幅图的比例尺是1∶50。[ ]

Last night I drove a long way (about 500 km) to return home. It was late and I was driving fast because I wanted to get home as soon as possible. So several times when I was driving behind a slow-moving truck on a narrow road, I wanted to shout at the driver ahead.

Then I came to a crossroad with a traffic light. As I drove near, it turned red. I stopped my car at once. I looked left，right and behind. I found no cars or persons — I was alone on the road. The person who would come to the crossroad was at least a mile away in any direction. Certainly going through the light would cause no danger. I could pass the traffic light. But strangely enough, I just stopped there, waiting for several minutes until the light went green. I asked myself why I refused to run the light. Surely it was unnecessary for me to be afraid of danger or being fined (罚款), because there were no cars or police around at all. But I remained waiting until the light changed.

When I finally got home, it was near midnight. My wife had fallen asleep. The question of why I stopped for that light came back to me again, because I stopped another two times for the red lights as “special” as the first one. I stopped, not because of the law, but because it was a good habit I had developed. In fact, we were used to doing something right just because we have made obeying the rules a good habit. We do it just because we should do it. I thought if another man met with the same thing, he would make the same choice. I believed so. And I could be trusted (信任) by others. I believed that everyone would and could control (控制) himself/herself well. It was amazing that we trusted each other to do the right things, wasn’t it?

小题1:When the author drove behind the slow-moving truck, he felt ____.

A．confused but happy

B．sleepy and tired

C．excited but tired

D．angry and worried小题2:Who made the author stopped at the crossroad?

A．A policeman.

B．The author’s wife.

C．The author himself.

D．Another driver.小题3:The author waited until the light went green because ____.

A．running the light would make him fined

B．he was afraid to cause an accident

C．he was prevented by the passers-by

D．he was used to obeying traffic rules小题4:The author is a person who ____.

A．believes others easily

B．can control himself well

C．treats others very unfriendly

D．is very experienced in driving小题5: We can infer from the passage that ____.

A．running the light could help the author get home earlier

B．the author’s wife was angry because he got home late

C．the truck driver in front of the author might be drunk

D．it was very necessary to have very strict traffic rules

车场变电所分（）变电所、跟随式降压变电所。

A.牵引降压

B.降压

C.牵引降压混合

D.牵引