单项选择题

A．Counting sheep.
B．Taking sleeping pills.
C．Drinking coffee.
D．Drinking milk.
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单项选择题
A．Red.B．Green.C．Blue.D．Purple.
A．Red.
B．Green.
C．Blue.
D．Purple.
单项选择题
All of the following aspects of backpacking are discussed in the passage except________.
A．wearing several layers of clothing
B．getting maximum use from your pack material
C．improving the warmth of your sleep
D．forecasting the weather
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