单项选择题

What is the cause of playground injures

A．Children don’t get enough education in safety.
B．The playgrounds are in poor condition.
C．Children are keen on dangerous games.
D．The playgrounds are overcrowde
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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.
单项选择题
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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