单项选择题

Deserts and high mountains have always been a ______ to the movement of people from place to place.

A．barrier
B．fence
C．prevention
D．jam
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单项选择题
It ______ you to at least 50% off the regular price of either frames or lenses when you buy both.
A．presents
B．entitles
C．credits
D．tips
单项选择题
I was so ______ in today's history lesson. I didn't understand a thing.
A．amazed
B．neglected
C．confused
D．amused
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