题目内容

【题目】分布在我国地势第二阶梯上的主要地形类型是

A.高原、山地B.高原、盆地C.盆地、平原D.平原、丘陵

【答案】B

【解析】

根据我国的地势特点是:西高东低,呈三级阶梯状分布.第一、二阶梯的分界山脉是昆仑山脉、祁连山脉、横断山脉一线,第二、三阶梯的分界山脉是大兴安岭、太行山、巫山、雪峰山一线.第二阶梯上主要分布有塔里木盆地、四川盆地、准噶尔盆地、内蒙古高原、黄土高原、云贵高原等,地形以高原和盆地为主,进行分析解答。

我国地势特点为西高东低,呈三级阶梯状分布;第一阶梯上主要有青藏高原、柴达木盆地,地形以高原、盆地为主;第二阶梯上主要分布有塔里木盆地、四川盆地、准噶尔盆地、内蒙古高原、黄土高原、云贵高原等,地形以高原和盆地为主;第三阶梯的地形区有东北平原、华北平原、长江中下游平原,辽东丘陵、山东丘陵、东南丘陵,因此第三级阶梯地形以平原、丘陵为主。故选项B符合题意。故选:B

练习册系列答案
相关题目

【题目】 Imagine a perfect day: the weather is good and everything seems fine. When, suddenly, your mobile phone loses its signal, the television has no programs, and you can’t get online with your computer.

What has happened? These are just the types of problems a solar storm(太阳风暴)might cause. You may not think of storms as putting our society in danger. But today, a solar storm is as serious as other bad events, such as earthquakes.

A solar storm is caused by solar flares(太阳耀斑): large explosions(爆炸) near the sun that can give off lots of energy. The strong energy can stop the satellite systems(卫星系统)that control our computers, telecom networks and so on. These storms can even cause the power to go out for weeks or months.

In the past of months, scientists have recorded some of the strongest sun flares in years. The most recent one happened around Valentine's Day, 2011. It caused radio and satellite signals to go down in some northern cities in China.

“Solar Flare activity is going to be much worse than what we’ve seen in the past. We’re not talking about a few cities losing power. It could be half of the country, maybe more.” SolarStormWarning. com, a US website about space weather, warned.

Scientists say that little can be done to predict such a storm. Governments around the world are trying to work together before the next storm, although they are not sure when that may happen.

1According to the passage, a solar storm can cause many problems EXCEPT that________.

A.earthquakes happenB.mobile phones have no signals

C.people cannot get onlineD.the power may go out

2According to the passage, solar flares are________.

A.telecom networksB.solar storms

C.large explosions near the sunD.US websites

3From the passage, the right order of the following is________.

a. solar flares give off lots of energy b. people can’t get online with their computers

c. solar storms happen d. satellite systems are stopped

A.a-b-c-dB.a-c-d-bC.c-a-b-dD.c-b-a-d

4The writer wrote the passage mainly to________.

A.call for scientists to predict when the next solar storm will happen

B.tell people how to solve the problems caused by solar storms

C.introduce what solar storms are to people

D.ask people to work to prevent the solar storm from happening

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