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
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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
单项选择题
Midori moved to the United States to
A．live a more comfortable life
B．give performances
C．be a pupil of a famous violinist
D．enter a famous university
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