问题 综合

长江上游地区地形复杂,自然资源较丰富,大部分地区年降水量在800~1600mm之间。根据所学知识和下列材料,回答(1)—(5)题。

材料一

材料二

重庆三峡库区水土流失面积构成

材料三

重庆三峡库区水土流失与地形坡度的关系

(1)长江上游流域的优势自然资源有________、________、________等。

(2)重庆三峡库区水土流失面积比重最大的土地类型是________;在地形坡度5°~25°范围内,随着坡度

的增大,水土流失面积比例________。

(3)长江上游流域水土流失对生态环境的影响有____(多选题,填选项字母)。

A.植物种类增加

B.土壤肥力降低

C.涵养水源能力下降

D.泥沙淤积河道和湖泊

E.增加降水量,引发滑坡、泥石流

(4)分析影响该区域水土流失的自然因素。

___________________________________________________________________________________________

(5)提出该区域水土流失的治理对策。

___________________________________________________________________________________________

答案

(1)水资源;水力资源;矿产资源;生物资源(森林资源)(答出三项即可)

(2)旱地;增大

(3)BCD

(4)自然因素:①降水(强度);②地形坡度;③土质条件;④植被状况。

(5)治理对策:①(封山育林)保护植被;②退耕还林还草(增加地表植被覆盖);③建设水土保持工

程;④实施生态移民;⑤调整产业结构。

阅读理解

Research advances over the past decade have told us that, with a little work, we humans can clone just about anything we want, from frogs to monkeys and probably even ourselves!

So, we can clone things, but why would we want to?

Of all the reasons, cloning for medical purposes has the most potential to benefit large numbers of people. How might cloning be used in medicine?

1. Cloning animal models of disease

Much of what researchers learn about human disease comes from studying animal models such as mice. Often, animal models are genetically engineered to carry disease-causing mutations(变异) in their genes. Creating these transgenic(转基因的) animals is a time-intensive process that requires trial-and-error and several generations of breeding(培育). Cloning technologies might reduce the time needed to make a transgenic animal model, and the result would be a population of genetically identical animals for study.

2.Cloning stem cells(干细胞) for the treatment of diseases

Stem cells are the body's building blocks, responsible for developing and repairing the body throughout life. As a result, they might be used to repair damaged or diseased organs and tissues. Researchers are currently looking up cloning as a way to create certain human stem cells for the research of diseases.

3. Cloning farm animals for drug production

Farm animals such as cows, sheep and goats are currently being genetically engineered to produce drugs or proteins that are useful in medicine. Just like creating animal models of disease, cloning might be a faster way to produce large herds of genetically engineered animals.

小题1:From Purpose One, we can infer that      .

A.most transgenic animals are clone

B.most animals carry engineered genes

C.most transgenic animal models are not cloned

D.most animals carry disease-causing mutations in their genes小题2:It can be learned from Purpose Two that cloning technologies can be mainly use do    .

A.create damaged or diseased organs and tissues

B.clone genetically defined human stem cells

C.develop and maintain the body

D.repair the body throughout life小题3:According to Purpose Three, cloning technologies can be mainly used to      .

A.speed up the producing of genetically engineered animals

B.produce drugs or proteins that are useful in medicine

C.raise genetically engineered cows, sheep and goats

D.produce large herds of animals for human beings

单项选择题