首页
登录
职称英语
Tornadoes, whirlwinds, and watersprouts are rotating funnel cloud air masses
Tornadoes, whirlwinds, and watersprouts are rotating funnel cloud air masses
游客
2024-06-11
13
管理
问题
Tornadoes, whirlwinds, and watersprouts are rotating funnel cloud air masses of small diameter. They are differentiated by the intensity 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. Watersprouts 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. [br] 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
这道题考生注意到文中"Some tornadoes give no visible warning until their distraction strikes the unsuspecting victim.”“no visible”也就是“cannot be seen.”所以应选B。
转载请注明原文地址:https://tihaiku.com/zcyy/3629940.html
相关试题推荐
Tornadoes,whirlwinds,andwatersproutsarerotatingfunnelcloudairmasses
Tornadoes,whirlwinds,andwatersproutsarerotatingfunnelcloudairmasses
Tornadoes,whirlwinds,andwatersproutsarerotatingfunnelcloudairmasses
Tornadoes,whirlwinds,andwatersproutsarerotatingfunnelcloudairmasses
Tornadoes,whirlwinds,andwatersproutsarerotatingfunnelcloudairmasses
随机试题
Amanis48yearsold.Heaskstheothermanhowoldheis.Theothermananswer
TheUnitedStatesofAmericaisoftenseenasanationinwhichthepursuit
HowtoMakeAttractiveandEffectivePowerPointPresentationsA)MicrosoftPowerP
Thewordhugisofuncertainorigin.TheOxfordEnglishDictionarycautions
Accordingtoasurvey,whichwasbasedontheresponsesofover188,000stud
立体的三面投影,其尺寸一般标注在反映形体特征的投影图上。
Thechangeinthatvillagewasmiraculou
急性呼吸窘迫综合征的病理基础是()。A.低氧血症 B.酸中毒 C.肺泡内及间
活期储蓄存款开户起存金额是( )。A.1元 B.10元 C.50元 D.
为了解超高压和特高压线路电晕放电现象需计算导线表面电场强度及电晕临界电场强度。其
最新回复
(
0
)