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 ground.
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单项选择题
Which of the following is NOT the result of a tornado
A．Insects are unable to balance themselves.
B．It is difficult to breathe.
C．A tornado destroys everything on its path.
D．A tornado kills 120 people every time it comes.
单项选择题
What did Johnston, the American musician, ask Midori to do
A．To play the violin once again.
B．To go to the United States.
C．To accept a full scholarship.
D．To make a tape recording.
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