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.

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热门试题

单项选择题

According to the passage, which of the following behaviors is frequently characteristic of funnel clouds

A．Descending from different cloud bases.
B．Occurring in isolated areas.
C．Lasting a long time.
D．Occurring in groups.

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.