疥疮的传染途径是（）。 A.接触传播 B.飞沫传播 C.血液传播 D.消化道传播 E

阅读理解。

     Sometime early in the next century, human beings will move to Mars. They will live

there for about a year, and then will be replaced with another group of pioneers. Building

the base on Mars will advance our knowledge of the solar system and aid in our

understanding of the earth.

      We already know that Mars resembles the earth in many aspects : general size,

presence of water, lengthof day, range of temperatures. These resemblances have

caused many people to consider a centuries-long project: to transform Mars.

Transforming means alterinB a planet's surface so that the Earth's life forms can

survive there. This concept, previously found only in science fiction is now being

seriously considered by scientists.

     Transforming Mars is theoretically simple : add nitrogen (氮气)and oxygen to the

atmosphere; pump water to the surface; and add the earth's plants and animals in the

order in which they developed on the Earth. But it will take at least 300 years.

     Some people think that such a project is too huge for humans to undertake, but

there are very good reasons to make the attempt. The earth now contains some 6

billion people and no one has any idea of how many humans the earth can support.

Our very existence and numbers are threatening many other species. We also have

had some experience with transforming our own planet : altering thelandscape ,

theatmosphereand the climate. Currently transforming earth has become a wiser activity

as we try to control global warming, air and water pollution, and' preserve some natural

living places.

      While the possibility of such a project is small, it is not impossible. Even if earthbound

societies come and go in the next 300 years, the project can continue through the work

of the Mars settlers without the need for constant backing from the earth.

The future existence of all the people in our world may very well depend upon our ability

to transform Mars.

1. What does the underlined word " altering"mean in the second paragraph?_______

A. Warming.

B. Changing.

C. Planting.

D. Building.

2. According to the passage the main purpose of transforming Mars is to._______

A. do some scientific research work

B. find out its similarity to the Earth

C. avoid the dying way of many other species

D. find on Mars living place for the increasing human beings

3. The main reason for causing many people to consider transforming Mars is that._______

A. there are some resemblances between the Earth and Mars

B. transforming Mars is theoretically simple

C. our existence and numbers are threatening many other species

D. the development of science and technology is very rapid

4. What's the author's attitude towards the project?______

A. Optimistic.

B. Negative.

C. Sceptical(怀疑的 ) .

D. Objective.

目前对新建中小学、幼儿园视频安防监控系统验收，其验收项目至少有：（）

A、图像质量

B、控制切换、回放

C、监视目标有效性

D、出入口摄像机本地存储和录像时间

E、与上级部门监管平台联网

F、字符叠加

不同生物分解嘌呤碱的终产物不同，人类和灵长类动物嘌呤代谢一般止于（），灵长类以外的一些哺乳动物可生成（）；大多数鱼类生成（）：些海洋无脊椎动物可生成（）。

在增压空气限油环节中，增压空气限制不起作用的条件是（）。

A.在起动期间

B.在正常运行中

C.在加速期间

D.在程序负荷限制期间

2. 取“人力资源情况表”的“人员类型”列和“所占比例”列的单元格内容(不包括“总计”行)，建立“分离型饼图”，数据标志为“显示百分比”，标题为“人力资源情况图”，插入到表的A9：E29单元格区域内。