单项选择题

A．370.
B．3,700.
C．37,000.
D．370,000.
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单项选择题
A．Beginning.B．Intermediate.C．Advanced.D．It s hard to say.
A．Beginning.
B．Intermediate.
C．Advanced.
D．It"s hard to say.
单项选择题
A．Global warming in Antarctica.B．Penguins in Antarctica.C．Tourism in Antarctica.D．Environmental protection in Antarctica.
A．Global warming in Antarctica.
B．Penguins in Antarctica.
C．Tourism in Antarctica.
D．Environmental protection in Antarctica.
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