在肠道的正常菌群中．对人有益无害的生理性菌群是A．大肠埃希菌 B．变形杆菌 C．乳杆

徐珂《清稗类钞》记述：“先由男子陈志愿于父母，得父母允准，即延介绍人约期订邀男女会晤，男女同意，婚约始定。”这反映晚清婚俗的变化是[ ]

A．媒妁之言控制婚约缔定

B．婚姻尊重当事人的意愿

C．婚姻听凭父母安排

D．婚姻仪式简约文明

I felt it rather inappropriate to turn up at the graduation ceremony ________ jeans and a Tshirt.[ ]

A. on  

B. with

C. in  

D. by

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, length of day, range of temperatures. These resemblances have caused many people to consider a centuries-long project: to terraform Mars. Terraforming means altering a planet’s surface so that Earth’s life forms can survive there. This concept, previously found only in science fiction is now being seriously considered by scientists.

Terraforming Mars is theoretically simple: add nitrogen 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 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 terraforming our own planet: altering the landscape, the atmosphere and the climate. Currently terraforming 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 earth –bound 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 terraform Mars.

小题1:What would be the best title for this passage?

A．Terraforming Mars.

B．Saving the Earth

C．Travelling to Mars.

D．A Newly-found Place小题2:What does the underlined word “altering” mean in the second paragraph?

A．Warming.

B．Changing.

C．Planting.

D．Building小题3:According to the passage the main purpose of terraforming Mars is to ________.

A．do some scientific research work

B．find out its similarity to earth

C．avoid the dying away of many other species

D．find on Mars living place for the increasing human beings小题4:The main reason for causing many people to consider terraforming Mars is that _______.

A．there are some resemblances between Earth and Mars.

B．terraforming Mars is theoretically simple

C．we have had some experience with terraforming our own planet: Earth

D．the development of science and technology is very rapid小题5:What’s the author’s attitude towards the project?

A．Optimistic.

B．Negative

C．Sceptical（怀疑的）

D．Objective.

古立克认为，行政组织要真正做到融合成一个整体，一定要从______重视协调，愿意并且尽力朝着一个目标共同努力。

各单位必须加强对会计档案管理工作的领导，建立会计档案的立卷、归档、保管、查阅和销毁等管理制度保证会计档案（）、散失和泄密。

A.妥善保管

B.有序存放

C.方便查阅

D.严防毁损