单项选择题

You can see the stars on a clear night, but in the daytime they are ______.

A. unavoidable
B. invisible
C. inaccessible
D. unavailable
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单项选择题
To overcome the difficulty they were faced with, several companies ______ to form a big one.
A. linked
B. united
C. joined
D. connected
单项选择题
Wild pigs are fierce and courageous fighters and may charge with little or no ______.
A. protection
B. provision
C. provocation
D. prevention
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