单项选择题

A．He has had thirteen decayed teeth.
B．He doesn’’t have a single decayed tooth.
C．He has fewer decayed teeth than other people of his age.
D．He never had a single tooth pulled out before he was fifty.
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单项选择题
A．It needs to be painted.B．It isn’’t beautifully painted.C．He hired a person to paint it.D．He painted the house by himself.
A．It needs to be painted.
B．It isn’’t beautifully painted.
C．He hired a person to paint it.
D．He painted the house by himself.
单项选择题
According to the passage, the use of Antarctic krill as a food is an innovation whose future is ______.
A．basically gloomy but still uncertain
B．somewhat promising but very tentative
C．generally bright and virtually assured
D．endangered by certain technical problems
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