单项选择题

According to the passage, some tornadoes take people unaware because they

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.

<上一题目录下一题>

热门试题

单项选择题

How are tornadoes distinguished from whirlwinds

A．Whirlwinds rotate in a different direction than tornadoes do.
B．Tonadoes travel over land and whirlwinds over water.
C．Tonadoes are larger than whirlwinds.
D．Only tornadoes are funnel - shaped.

单项选择题

The author refers to straw embeded in fence posts in order to show

A．where tornadoes occur.
B．who makes reports about tornadoes.
C．when tornadoes take form.
D．how tornadoes affect physical objects.