单项选择题

The author believes that everything in your pack should ______.

A．be lightweight
B．serve an important purpose
C．serve several purpose
D．keep the pack warm
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单项选择题
According to the passage, it would be more advantageous to pack ______.
A．a light sleeping hag, pants and shorts, a heavy jacket, and a shirr
B．a light sleeping bag, two pairs of pants, and a heavy jacket
C．a light sleeping bag, two pairs of pants, and a light sweater and shirt
D．a light sleeping bag, pants and shorts, and a light sweater and shirt
单项选择题
From the passage we understand that conventional plant breeding produced ______.
A．a potato-tomato hybrid
B．new plant technology
C．self fertilizing
D．less dramatic results than the new technology
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