在用于构图的线形中，折线易显（）。 A.优美 B.有力 C.柔顺 D.和缓

在下列各种垫层中，适合用于消除膨胀土的胀缩作用的是（）。

A.灰土垫层 

B.素土垫层 

C.素混凝土垫层 

D.级配砂石垫层

在许可系统中（不考虑延长、听证等情况），许可受理后应该在多少工作日内办结此许可（）

A、5

B、10

C、20

D、30

如图所示，斜面体A静止放置在水平地面上。质量为m的滑块B在沿斜面向下的外力F作用下向下运动，此时斜面体受到地面的摩擦力方向向右。若滑块B在下滑时撤去F，滑块仍向下运动的过程中，下列说法中正确的是（   ）

A．斜面体A所受地面摩擦力可能为零

B．斜面体A所受地面摩擦力的方向一定向右

C．滑块B的加速度方向可能沿斜面向下

D．斜面体A对地面的压力一定变小

One summer I was driving from my home town of Tahoe City，Calif.，to New Orleans.In the middle of the desert，I came upon a young man standing by the roadside.He had his thumb out and held a gas can in his other hand.I drove right by him.There was a time in the country when you’d be considered a jerk if you passed by somebody in need.Now you are a fool for helping.With gangs，drug addicts，murderers，rapists，thieves lurking everywhere，“I don’t want to get involved” has become a national motto.

Several states later I was still thinking about the hitch­hiker.Leaving him standing in the desert did not bother me so much.What bothered me was how easily I had reached the decision.I never even lifted my foot off the accelerator.

Does anyone stop any more？I wondered.I recalled Blanche DuBois’s famous line：“I have always depended on the kindness of strangers”．Could anyone rely on the kindness of strangers these days？One way to test this would be for a person to journey from coast to coast without any money，relying solely on the good will of his fellow Americans.What kind of Americans would he find？Who would feed him，shelter him，carry him down the road?

The idea intrigued me.

The week I turned 37，I realized that I had never taken a gamble in my life.So I decided to travel from the Pacific to the Atlantic without a penny.It would be a cashless journey through the land of the almighty dollar.I would only accept offers of rides，food and a place to rest my head.My final destination would be Cape Fear in North Carolina，a symbol of all the fears I’d have to conquer during the trip.

I rose early on September 6,1994，and headed for the Golden Gate Bridge with a 50­pound pack on my back and a sign displaying my destination to passing vehicles：“America”．

For six weeks I hitched 82 rides and covered 4,223 miles across 14 states.As I traveled，folks were always warning me about someplace else.In Montana they told me to watch out for the cowboys in Wyoming；in Nebraska they said people would not be as nice as in Iowa.Yet I was treated with kindness everywhere I went.I was amazed by people’s readiness to help a stranger，even when it seemed to run contrary to their own best interests.

小题1:Why did the author drive past the young man in the desert without stopping?

A．Because he failed to notice this man.

B．Because he was driving too fast.

C．Because he thought the young man didn’t need help.

D．Because he was afraid of being tricked.小题2:What was it that made the author upset?

A．Leaving the young man alone in the desert.

B．Being considered a fool.

C．Making the decision of not offering help so easily.

D．Keeping thinking about the young man.小题3:The author decided to travel without a penny in order to ________.

A．find out how long he could survive without help

B．go through the great difficulty in surviving unexpected environment

C．find out whether strangers would offer help to him

D．figure out how strangers thought of his plan小题4:The following part might probably ________.

A．describe how he fooled the strangers

B．describe how strangers went out their way to help him

C．explain why people refused to help strangers

D．explain how he overcame his difficulties on the way

事故性质的判定由（）统一组织，可以根据需要由各业务主管部门成立联合调查组，必要时可以邀请地方技术专家参与。

A.公安部

B.总队

C.支队

D.中队