单项选择题

A．Cooperation and concession.
B．Equality and mutual benefit.
C．Exchanging daily necessities.
D．Introducing advanced technology.
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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.
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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