下肢深静脉血栓形成最严重的并发症是()A．下肢溃疡 B．下肢静脉曲张 C．下肢静脉破

如图所示，一质点沿半径为r=20cm的圆周自A点出发，逆时针运动2s，运动

3

4

圆周到达B点，求：

（1）质点的位移和路程．

（2）质点的平均速度和平均速率．

各项中不属于医疗秘密的是

A．患者及其家庭隐私

B．医师及其家庭隐私

C．患者独特的体征畸形

D．患者不愿让别人知晓的疾病

E．关于患者的不良诊断和预后

不会使活塞式制冷压缩机输气系数降低的是（）。

A．冷凝器脏污

B．活塞环失去弹性

C．缸套垫片加厚

D．滑油压力不足

读写任务

阅读下面的短文, 然后按照要求写一篇150词左右的英语短文。

     The New Year is a holiday for many people. It is a day of leisure and celebrations. But for a lot of others it is a normal working day-they have to toil for the rest to celebrate. Many of the workers, small business/people, bus and train drivers and dispatchers work so that we can enjoy our holidays.

     Most of our dreams are realized on the hard work of others. Their contributions add fresh colors to

society. That’s the reality of life. But society does not belong to the great and the successful alone. It belongs to those whose struggle never ceases.

     Their condition may not change much in the New Year. Their achievements, even their existence, may

not be acknowledged.

     But we firmly believe they will never cease to move forward. There should be happiness in the lives of

all.

     Therefore, we solemnly send our New Year greetings to them, to the common folks whose struggle for a better life never ceases.

     They are humble, but it is their joint endeavor that propels society forward. They may not share the

wealth and power they so richly deserve, but their position in society can never be disputed.

     May they find happiness in the New Year.

【写作内容】

1. 以约30个词概括短文内容要点；

2. 然后以约120个词就“如何为社会做贡献”这个主题发表你的看法, 内容包括：

(1)作为高三的学生如何服务社会；

(2)以亲身经历或他人的事例说明人人都能对社会有所贡献；

(3)自己对未来的设想。

【写作要求】

1. 作文中可使用自己的亲身经历或虚构的故事, 也可以参照阅读材料的内容但不得直接引用原文中的句子；

2. 文中不能出现真实姓名和学校名称。

【评分标准】

概括准确, 语言规范, 内容合适, 篇章结构连贯。

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计算机网络拓扑结构的类型中，不包括（）。

A、星形

B、环形

C、总线形

D、层次形