单项选择题

A．She’’s unable to attend the study session.
B．She has seen a doctor recently.
C．She’’s concerned about medical care.
D．She mentions the need for some medical tests.
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单项选择题
A．Crowded air traffic.B．The large size of airplanes.C．Mistakes by air traffic controllers.D．Bad weather.
A．Crowded air traffic.
B．The large size of airplanes.
C．Mistakes by air traffic controllers.
D．Bad weather.
单项选择题
The problem of population is mainly man-made.
A．Y
B．N
C．NG
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