单项选择题

A．Make up homework problems.
B．Do research in the library.
C．Teach an introductory economics course.
D．Grade homework sets.
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单项选择题
A．A swimming pool.B．A high ground.C．Under a tree.D．A closed car.
A．A swimming pool.
B．A high ground.
C．Under a tree.
D．A closed car.
单项选择题
The passage mainly talks about protecting children after tsunami disaster.
A．Y
B．N
C．NG
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