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
2023-09-14
11
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] Why do tornadoes appear to be dark?
选项
A、They occur only at night.
B、They are funnel-shaped.
C、They pick up debris from the ground.
D、They are water-laden.
答案
C
解析
这道题的解题关键就是文中"As this funnel dips earthward,it becomes darker because of the debris that is forced into its intensifying votex.”
转载请注明原文地址:https://tihaiku.com/zcyy/3013672.html
相关试题推荐
【B1】[br]【B13】A、revolvingB、stirringC、mixingD、rotatingB因为河堤很坚固,所以船行驶时激起的水才不会
【B1】[br]【B13】A、revolvingB、stirringC、mixingD、rotatingB砖块、石头和水泥可使岸堤坚固,因此即使水面
Tornadoes,whirlwinds,andwatersproutsarerotatingfunnelcloudairmasses
Tornadoes,whirlwinds,andwatersproutsarerotatingfunnelcloudairmasses
Tornadoes,whirlwinds,andwatersproutsarerotatingfunnelcloudairmasses
Tornadoes,whirlwinds,andwatersproutsarerotatingfunnelcloudairmasses
Tornadoes,whirlwinds,andwatersproutsarerotatingfunnelcloudairmasses
随机试题
Inpolicework,youcanneverpredictthenextcrimeorproblem.Noworking
通货膨胀是指商品和服务的货币价格总水平持续上涨的现象。衡量通货膨胀的指数有多个,
环境管理体系标准是适用于各行各业、任何类型和规模的组织的()标准。A:建议性
青皮的功效是A.破气消积,化痰除痞 B.疏肝破气,化痰除痞 C.疏肝破气,散
消弧线圈全面巡视时应检查设备底座、支架应支撑(),无倾斜或变形。牢靠$;$牢固
B第一个与第五个字符一致,第四个与第七个一致,其余字符均不同。
根据《民法典》,下列关于建设用地使用权的表述中,不正确的是()。(2018
中国古代筑城中的“形胜”思想,准确的意思是?A.等级分明的布局结构 B.“象天
(1)海滩上海鸟开始死亡(2)原油泄漏 (3)海水污染(4)油轮触礁
全蝎研末内服,成人每次服用量A.0.6-1g B.1.5-2g C.2.5-
最新回复
(
0
)