单项选择题

A．Hiking.
B．Canoeing.
C．Swimming.
D．Camping.
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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.
单项选择题
A．Advantages and disadvantages of freezers.B．The best energy-efficient freezer.C．Defrosting a manual defrost freezer.D．Choosing and caring for a freezer.
A．Advantages and disadvantages of freezers.
B．The best energy-efficient freezer.
C．Defrosting a manual defrost freezer.
D．Choosing and caring for a freezer.
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