下列有关实验现象的描述与事实不相符的是[ ] A．红磷在空气中燃烧产生大量的白烟

"争议评审委员会"（DRB），作为对美国标准施工合同的补充，以取代监理工程师对合同争议作出决定，它旨在通过非正式的方式（）地解决施工过程中发生的争议。

A.及时、有效

B.公平、公正

C.公平、有效

D.及时、公正

When my son, Mark, was in the third grade, he saved all his pocket money for over three months to buy holiday presents. The third Saturday in December Mark said he had made his list and had twenty dollars in his pocket.

I drove him to a nearby supermarket. Mark picked up a hand basket and went in while I waited and watched in the car. It took Mark over 45 minutes to choose his presents. Finally he came to the checkout counter (交款处) and reached into his pocket for his money. It was not there! There was a hole in his pocket, but no money. Mark stood there holding his basket, tears falling down his face.

Then a surprising thing happened. A woman came up to Mark and took him in her arms. "You would help me a lot if you let me pay for you," said the woman. "It would be the most wonderful gift you could give me. I only ask that one day you will pass it on. When you grow up, I  would like you to find someone you can help. When you help others, 1 know you will feel as good about it as I do now."

Mark took the money, dried his tears and ran back to the checkout counter as fast as he could. That year we all enjoyed our gifts almost as much as Mark enjoyed giving them to us.

I would like to say ’"thank you" to that very kind woman, and tell her that four years later, Mark went house to house collecting blankets (毯子) and clothes for the homeless people in the fire. And I want to promise her that Mark will never forget to keep passing it on.

小题1:When did the story probably happen?

A．On Christmas Day.

B．Before Christmas Day,

C．On New Year’s Day.

D．After New Year’s Day.小题2:Why did the writer want to say ’’thank you" to the woman?

A．Because she bought Mark a nice present.

B．Because she always paid money for others.

C．Because she collected clothes for the homeless.

D．Because she taught Mark to help people in need.小题3:What’s the best title for this passage?

A．A big supermarket

B．A kind woman

C．A happy family

D．A wonderful gift

某四冲程六缸柴油机的发火顺序为：1-5-3-6-2-4，如果采用盘车两次来调节整机的气阀间隙，当将第一缸活塞盘到发火上止点时，可调节的气阀是（）。

A．1进、1排、5排、3排、2进、4进

B．1进、1排、5进、3排、2进、6排

C．1进、1排、5排、3进、2排、4进

D．1进、1排、5进、3进、2排、4排

花色冷盘用料量多、品种多，故在宴席中往往单上便可满足食用要求。( )

硬盘存储器是PC机最重要的、必备的外存储器。下面关于硬盘的叙述中，错误的是：

A．硬盘存储器的驱动器和盘片组装成一个整体，用户不能更换盘片

B．硬盘的盘片可能不止1片

C．硬盘盘片的转速很高，目前大约每秒钟几千转、甚至上万转

D．由于盘片转动速度特快，因此读写数据时磁头悬浮在盘片上方，不与盘片接触