单项选择题

A．They are accurate and easy to pull.
B．Their shooting range is 40 yards.
C．They are usually used indoors.
D．They took 100 years to develop.
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单项选择题
If you want to be left alone on an elevator, the best thing to do is______.
A．to look into another passenger’’s eyes
B．to avoid eye contact with other passengers
C．to signal you are not a threat to anyone
D．to keep a distance from other passengers
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