单项选择题

He will probably be awarded a Nobel Prize on account of his __________ achievements in chemistry.

A．high
B．worthwhile
C．outstanding
D．powerful
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单项选择题
The neighbors do not consider him quite __________ as most evening he awakens them with his drunken singing.
A．respectful
B．respectable
C．respective
D．respected
单项选择题
His compass proved __________ to him when he was lost unknown country.
A．valuable
B．expensive
C．precious
D．costly
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