首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Are you planning a vacation? If you like hot and extremely dry summers, go to Phoenix, Arizona. For hot temperatures but lots of
Are you planning a vacation? If you like hot and extremely dry summers, go to Phoenix, Arizona. For hot temperatures but lots of
admin
2014-08-25
92
问题
Are you planning a vacation? If you like hot and extremely dry summers, go to Phoenix, Arizona. For hot temperatures but lots of rain and thunderstorms, try Miami, Florida. If you want average temperatures and rainfall, St. Louis, Missouri, is the spot. Or if you’ re a cold weather fan, head to Fairbanks, Alaska. Its winters are very cold with little precipitation. Each of these cities has a certain type of weather. The average weather for a place over many years is called climate, and in no two places in the world is it exactly the same. How can this be?
Many things in nature, such as sunshine, temperature, and precipitation, affect climate. Nearness to mountain, oceans, and large lakes affects it too. Another factor is altitude, or height above sea level. Air cools as altitude increases. So a city at a higher altitude may be colder than one at a lower altitude. Finally, winds affect climate. They move heat and moisture between the oceans and continents. Winds keep the tropics from overheating. They keep the polar regions from getting overly cold.
Climate changes over long periods of time. Some scientists think, for example, that the earth’ s climate changed at the time of the dinosaurs. They think the dinosaurs died because of the change. What causes a climate to change? One possible cause may be changes in the sun. Sunspots, for example, are cool, dark spots that form on the sun. Sunspots may decrease precipitation on the earth and cause unusually dry periods. Changes in the atmosphere may change climate too. Volcanic eruptions, for instance, release solid particles into the air. These particles may form a cloud that blocks out the sun’ s heat. Human activity is another cause of climate change. Air pollution and the reduction of forest cover may have long-term effects on climate.
Change in climate may have caused______.
选项
A、dinosaurs to die
B、dark spots to form on the sun
C、volcanic eruption
D、air pollution
答案
A
解析
第三段第二、三句话明白给出答案,科学家认为恐龙之死就是因为气候的变化。
转载请注明原文地址:https://kaotiyun.com/show/wAxO777K
0
成人本科学位英语
相关试题推荐
Ifyoutake(aten—orfifteen—minutes)vacation(into)therealmofimagination(eachday),youmay(addmuchto)theexcitement
Everycountrycriticizeswaysoflifeinothercountriesbecausetheyare______.Onewhotravelsinaforeigncountryandlea
Thestudentswishthesummervacation______now.
Giraffeshave(eyes)thatallowthem(seeing)inalldirectionswithout(twisting)their(heads).
Formorethanthirtyyearsscientistshavebeensearchingforsignsoflifeonotherplanets.Mostofthesesearcheshavebeend
Themarketinvestigationisindispensabletosalespromotion.Theyareascloselyrelatedasthelipsandteeth,sotospeak.Wh
她正在找从图书馆借来的那本书。
工厂和汽车排放的废气严重污染了大气。
在此期间,煤炭的销售价格及其利润会随着国际市场的需求变化而上下波动。
志愿者将帮助人们找到前往体操馆和体育场的正确的路。
随机试题
行政组织编制总体设计的依据是()
鉴别腹股沟斜疝与直疝最有价值的临床表现是
确诊慢性胃炎最可靠的检查方法
对流动人口中的传染性非典型肺炎病人、疑似病人处理的原则是
对于河流完全混合模式,影响污染物最终浓度的因素包括()。
海关对外商投资企业签发的“进出口货物征免税证明”是按()签发的。
在网络图中,计算时间值的目的包括()。
关于书刊装帧加工的说法,正确的是()。
设袋中有5个球,其中3个新球,2个旧球,从中任取3个球,用X表示3个球中的新球个数,求X的分布律与分布函数.
Parentswhosmokeoftenopenawindoworturnonafantocleartheairfortheirchildren,butexpertsnowhaveidentifiedar
最新回复
(
0
)