单项选择题

What is the problem with the space shuttle

A．Some gap fillers popped up.
B．The space shuttle was over-heated.
C．Two of the ceramic tiles were damaged.
D．The engine of the space shuttle was out of control.
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Which is NOT the reason given by Smith for people to send postcards
A．Telling others about their experience.
B．Telling others what they are thinking.
C．Showing where they have been to.
D．Showing off their wealt
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The purpose of the talk is______.
A．to review the last lecture on inflation
B．to introduce the concept of inflation
C．to discuss the causes of inflation
D．to argue in favor of inflation
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