单项选择题

A．Boston schools.
B．Frontier life.
C．Teaching requirements.
D．Immigration patterns.
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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.
单项选择题
The lakes are kept constantly full by the rains and by the melting of the snows.
A．Y
B．N
C．NG
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