单项选择题

The high-pitched whistle can heard at a distance of ______.

A．10km
B．5km
C．15km
D．8km
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单项选择题
Professor White has written some short stories but he is known ______ for his plays.
A．the best
B．more
C．better
D．the more
单项选择题
Though he was ______ in his later years, Tom didn't feel ______.
A．alone, lonely
B．lonely alone
C．alone, alone
D．lonely, lonely
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