苯胺中毒引起缺氧的主要原因为（） A.机体的运氧功能障碍 B.组织利用氧功能障碍 C

某服装按标价打八折后的售价是160元，则标价是（    ）元．

.

第三部分：阅读理解

请认真阅读下面短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项.

In the debates about how a particular piece of land is to be used, the priorities often conflict. What should you do, for example, if you find out that under the fertile fields of a farming community there is a thick bed of coal which can be strip mined(露天矿) ? Strip mining tears up top soil and plants. But mining may create jobs, bring money to the towns businesses. Those who approve of strip mining say that the coal is needed, and they point out that it is quicker and cheaper to get coal from the surface than to go deep into the earth to get it by standard mining techniques. On the other hand, it takes nature 500 years to create an inch of top soil. As the countryside fills up, people are becoming more aware of the need for open space. Nearly every proposal for a new power plant, highway, or airport draws fierce opposition. Everyone wants the big, land-eating “uglies” to be in someone else’s backyard. Minneapolis and St.Paul, Minnesota, for example, have been debating about the site of a future airport for years. Yet if a new airport is needed, it will have to go somewhere.

How do we find our way out of the land-used problem? One way might be to reexamine our values, to think in new directions. Does everyone have to have a car with its need for highways and parking lots? What about developing mass transport systems that use less land? Do suburbs have to spread? Can they be designed so they use less space? Do we have to have more energy? If we do, do we really have to strip-mine coal to provide it?

However difficult they may be to arrive at, choices will have to be made if we want to preserve the beauty and usefulness of the land. For there is at least one point on which all of us can agree: The land does have its limits.

1. The word “priorities” in the sentence means ____.

 A. the various needs           B. the most important goal

 C. the number one necessity     D. the first thing to be considered

2. “…, people are becoming more aware of the need for open space. ” tells us that ____.

 A. people are thinking to develop their living space into the sky

 B. people noticed the need for unoccupied land

 C. people are struggling to get more land from the space 

D. people are becoming more active on the space issue

3. How do we find our way out of the land use problems?

A. One way might be to reexamine our values, to think in new directions.

B. Everyone has to have a car with its need for highways and parking lots.

C. We have to have more energy. We need strip-mine coal to provide it.

D. We may develop mass transit systems which use less land.

4. “Everyone wants the big, land-eating ‘uglies’ to be in someone else s backyard.” shows that        .

 A. people don t want more big projects

 B. people don t want to live in the neighborhood of the big projects

 C. people regard the large construction projects are “uglies ”

 D. people don t like the undesirable building projects

5. The main idea of this article is ____.

  A. The Limits of Land            B. Land    

C. Land and Our Life Styles      D. Land and Space

建筑钢结构州钢材，按含碳量分应属于（）。

A.各种含碳量的钢材 

B.低碳钢 

C.高碳钢 

D.中碳钢

材料的塑性越好，表示材料产生塑性变形的能力越强。