单项选择题

A．Red.
B．Green.
C．Blue.
D．Purple.
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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
单项选择题
Using technology is an easy way to shop.
A．Y
B．N
C．NG
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