单项选择题

A．It did not occur.
B．It will never occur again.
C．It is beneficial.
D．It is disastrous.
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单项选择题
A．In Paris.B．In London.C．In Miami.D．In Washington D. C.
A．In Paris.
B．In London.
C．In Miami.
D．In Washington D. C.
填空题
Ecologists
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