单项选择题

Why does breathing become difficult for humans during a tornado

A．The wind becomes fast and hot.
B．Air pressure gets steadily lower.
C．The black area moves closer.
D．They are knocked to the groun
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单项选择题
Prior to the formation of a tornado, ______.
A．the sky is cloudy
B．the sky is very dark
C．the sky is cloudless
D．a black line stretches across the horizon
单项选择题
When Midori was two years old, she was not allowed to touch her mother's violin because ______.
A．she was too young to play the violin
B．the violin was too expensive
C．the violin was too big for her
D．her mother wanted her to play the piano
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