题目内容

【题目】荒漠化已成为当今全球最为严重的生态环境问题之一。根据联合国环境署推断,目前世界约1/4的陆地、2/3的国家和地区受到荒漠化的威胁。中国是全球荒漠化面积大、分布广、危害严重的国家之一,其中西北地区则是我国风沙危害和荒漠化问题最为突出的地区。据此回答下列各题。

【1】在荒漠化的发生、发展过程中,常常起决定性作用的是(

A.草原、荒漠为主的植被 B.人类活动 C.疏松的沙质沉积物 D.气候变异

【2】在西北地区荒漠化土地面积中,导致荒漠化的第一大人为因素是(

A.过度放牧 B.过度开垦 C.过度樵采 D.水资源利用不当

【3】下列有关西北地区荒漠化的叙述不正确的是(

A.20世纪50年代以来,由于人口压力所迫和管理失误,本区荒漠化趋于严重

B.从总体上看,特别是旱作地区和草原牧区,荒漠化仍在蔓延。

C.恢复自然植被是防治荒漠化的有效措施。

D.宁夏沙坡头采用方格状的沙障固沙,是为了保护兰新铁路被腾格里沙漠的侵袭

【答案】

【1】B

【2】C

【3】D

【解析】

试题分析:

【1】在荒漠化的发生、发展过程中,常常起决定性作用的是人类活动,植被、下垫面不是荒漠发展的决定原因,一个地区气候是稳定的,变化不明显,不是荒漠发展的主要因素。

【2】从五种导致荒漠化的人为因素百分比,可以看出其由大到小的排序依次是过度樵采、过度放牧、过度农垦、水资源利用不当、工矿交通建设中不注意环保。

【3】20世纪50年代以来,由于人口压力所迫和管理失误,西北地区荒漠化趋于严重,宁夏沙坡头草方格沙障固沙,是为了保护包兰铁路。

练习册系列答案
相关题目

【题目】When I was young, my mother didn't have the money to send me to school, but she thought it was important for me to keep up with education. So she decided to teach me extra lessons herself. But because she had to go to work, the only time she could do it was at 4:30 in the morning.

We need every one of you to develop your talents and your skills so that you can help us old folks solve our most difficult problems. If you quit on schoolyou're not just quitting on yourself, you're quitting on your country. No one's written your destiny(命运)for you, because you write your own destiny. You make your own future. That's why today I'm calling on each of you to set your own goals for your education and do everything you can to meet them. Your goal can be something as simple as doing all your homework, paying attention in class, or spending some time reading a book.

But whatever you decide to do, I want you to commit to it. I want you to really work at it. I know that sometimes you get that sense from TV that you can be rich and successful without any hard workthat your ticket to success is through rapping or basketball or being a reality TV star. No one's born being good at all things. You become good at things through hard work. You're not a good athlete the first time you play a new sport. You don't hit every note the first time you sing a song. You've got to practice.

【1】What can we learn from the first paragraph?

AThe writer's home was very rich.

BThe writer's mother was a teacher.

CThe writer was born in a poor family.

DThe writer didn't like reading books.

2What does the writer want everyone to do by improving their talents and skills?

ATo quit on their country to earn more money.

BTo offer help to the old people who have difficulties.

CTo write their own new destiny by working as TV star.

DTo spend some time writing books about their own life.

3Why does the writer call on everyone to set his/her own goal?

ABecause everyone's future is determined by themselves.

BBecause everyone's future is to do simple work.

CBecause everyone should do their homework.

DBecause everyone should pay attention in class.

4How can people realize their great dream?

ABy rapping.

BBy playing basketball.

CBy being a reality star.

DBy working hard.

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网