导致合同终止的原因主要有（）。 A.合同解除 B.债务相互抵消 C.债务人依法将标的

在地球上，氦元素主要是以⁴₂He的形式存在。下列有关说法正确的是

A．⁴₂He原子核内含有4个质子

B．³₂He原子核内含有3个中子

C．³₂He和⁴₂He互为同位素

D．⁴₂He的最外层电子数为2，所以具有较强的金属性

我国经济电流密度最大负荷使用时间3000～5000h铜裸导线为（）A/mm2。

A.2.0

B.2.25

C.2.5

D.3

I have recently completed my college degree. The last project was called “Smile”. The class was asked to go out to smile at three people and document their reactions（反应）. I am a very friendly person and always smile at everyone and say hello anyway. So, I thought this would be a piece of cake.

My husband, the youngest son and I went out to McDonald. We were standing in line when all of a sudden everyone around us began to back away. As I turned around I smelled a horrible body odour（气味） and saw two poor homeless men standing behind me. As I looked at the short blue-eyed gentleman closest to me, he was “smiling”. The second man fumbled（摸索）with his hands as he stood behind his friend.

The young lady at the counter asked him what they wanted. He said, “Coffee is all, Miss,” because that was all they could afford.

Then I really felt it — I embraced（拥抱）the little man with the blue eyes. That is when I noticed   all eyes in the restaurant were set on me, judging my every action. I smiled and asked two more breakfast meals on and gave them to the men.

The blue-eyed gentleman looked up at me, with tears in his eyes, and said, “Thank you.”

I turned in my project. My teacher said, “Can I share this?” I slowly nodded as she got the attention of the class. She began to read and that is when I knew that we as human beings share this need to heal people and to be healed.

In my own way I had touched the people at McDonald’s and every soul that heard the story in the classroom. But, I graduated with one of the biggest lessons I would ever learn.

小题1: The underlined part “a piece of cake” in Paragraph 1 means _______.

A．easy

B．embarrassing

C．moving

D．comfortable小题2:Why did people around the author in the McDonald step back?

A．Because they were very polite to the two men.

B．Because they were moved by the two men.

C．Because the two men smelt terrible.

D．Because the two men seemed unfriendly.小题3: Why did the two men only buy coffee?

A．Because they didn’t have enough money.

B．Because they didn’t feel hungry.

C．Because they knew others would help them.

D．Because they were looked down upon.小题4:How did the teacher think of the author’s project?

A．Hard to believe.

B．Interesting to read.

C．Very puzzling.

D．Very satisfying.小题5: What did the author think she learn from the story?

A．A friend in need is a friend indeed

B．Helping others can bring pleasure to many people.

C．Nothing is difficult to a willing heart.

D．Don’t judge people according to their appearance.

急性尿潴留病因中，属于动力性梗阻的是（）。

A.腰麻和肛管直肠术后

B.外伤性高位截瘫后

C.使用药物阿托品、普鲁本辛后

D.腹泻

E.长期使用利尿剂

在（）流式传输中，音视频信息可被实时听到或观看到，用户可快进或后退以观看前面或后面的内容。

A.顺序

B.实时

C.线性

D.任意