单项选择题

A．His injury kept him at home.
B．He didn’’t think it necessary.
C．He was too weak to see the doctor.
D．He failed to make an appointment.
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单项选择题
What is the author’’s main concern
A．How to render automobiles pollution-free.
B．How to make smaller and safer automobiles.
C．How to solve the problem of traffic jams.
D．How to develop an automated subway system.
单项选择题
The deadliest hurricane in U.S. history happened in Texas.
A．Y
B．N
C．NG
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