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
Tornadoes, whirlwinds, and water-sprouts are rotating funnel cloud air masses of small diameters. They are differentiated by the
Tornadoes, whirlwinds, and water-sprouts are rotating funnel cloud air masses of small diameters. They are differentiated by the
admin
2010-06-30
53
问题
Tornadoes, whirlwinds, and water-sprouts are rotating funnel cloud air masses of small diameters. They are differentiated by the intensities of their rotation and by the surfaces that they traverse. Though tornadoes and whirlwinds both travel over land masses, whirlwinds are atmospheric systems smaller than tornadoes. Water-sprouts are tornadoes that form or pass over a water surface. A tornado is a powerful vortex or "twister" whose rotational speeds are estimated to be near 300 miles per hour. The first visible indication of tornado development is usually a funnel cloud. As this funnel dips earthward, it becomes darker because of the debris that is forced into its intensifying vortex. Some tornadoes give no visible warning until their destruction strikes the unsuspecting victim. Tornadoes often occur in groups, and several twisters sometimes descend from the same cloud base. The forward speed of a tornado is normally 30 to 40 miles per hour. In the short time that it takes to pass, a tornado can cause fantastic destruction. There have been cases reported in which blades of straw were embeded in fence posts.
According to the passage, some tornadoes take people unaware because they ______.
选项
A、produce a sound similar to thunder
B、cannot be seen until it is too late
C、look so much like other clouds
D、carry so many large pieces of debris
答案
B
解析
由文中Some tornadoes gave no visible warning until their destruction strikes the unsuspecting victim可知。
转载请注明原文地址:https://www.kaotiyun.com/show/oqJd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
TherecentsocialandeconomicchangesintheUShavegreatimpactonalltheAmericanhousingsystem.
TherecentsocialandeconomicchangesintheUShavegreatimpactonalltheAmericanhousingsystem.
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
Whatisthefirstjobthemanappliedforrightafterhisuniversitygraduation?Whatagegroupsjointhetour?
Thepassageischieflyabout______.Itcanbeinferredfromthepassagethat______.
Manyofthemostdamagingandlife-threateningtypesofweather--torrentialrains,severethunderstorms,andtornadoes--beginqu
Manyofthemostdamagingandlife-threateningtypesofweather--torrentialrains,severethunderstorms,andtornadoes--beginqu
Heroinaddictionstodayisfoundchieflyamongyoungmenofminoritygroupsinghetto(犹太人区)areas.Ofthemorethan60,000known
Heroinaddictionstodayisfoundchieflyamongyoungmenofminoritygroupsinghetto(犹太人区)areas.Ofthemorethan60,000known
Tornadoes,whirlwinds,andwater-sproutsarerotatingfunnelcloudairmassesofsmalldiameters.Theyaredifferentiatedbythe
随机试题
Doyoufindgettingupinthemorningsodifficultthatitispainful?Thismightbecalledlaziness,butDr.Kleitmanhasanew
信访信件的主要内容不包括
工程施工合同中承包人的主要义务包括()。
10(6)kV变电所可燃性油浸电力变压器室的耐火等级应为二级。()
一般而言,协定价格与市场价格间的差距越大,时间价值越小;反之,则时间价值越大。( )
从某种意义上说,教师的()比道德宣言或道德演讲更能教育学生。
请用“家乡”“桃花”“生活”等词语写一段情景交融的文字。要求:想象合理,语言连贯,不少于40字。
以下权利不属于形成权的是()。
单位内部为了便于对员工进行培训,准备编写工作手册。如果领导将这项任务交给你来完成,你怎么做?
Herfriendshelpedher______afterhersisterwaskilledinacarcrash.
最新回复
(
0
)