单项选择题

A．Five.
B．Six.
C．Seven.
D．Eight.
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单项选择题
A．Hiking.B．Canoeing.C．Swimming.D．Camping.
A．Hiking.
B．Canoeing.
C．Swimming.
D．Camping.
单项选择题
A．Economical fuel.B．A new kind of fuel.C．Energy saving.D．Air pollution.
A．Economical fuel.
B．A new kind of fuel.
C．Energy saving.
D．Air pollution.
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