单项选择题

A．$ 300.
B．$ 200.
C．$ 500.
D．$ 450.
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单项选择题
A．The man wants to get authorization for a room change.B．The man is worried about his friendship with his roommate.C．The man needs a scholarship to continue living in the dormitory.D．The man wants the head resident to talk to David for him.
A．The man wants to get authorization for a room change.
B．The man is worried about his friendship with his roommate.
C．The man needs a scholarship to continue living in the dormitory.
D．The man wants the head resident to talk to David for him.
填空题
At that time the chemical explosion was thought to be_______________.
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