单项选择题

A．They are limited but effective.
B．They belong to the best in the world.
C．They are rapidly expanding.
D．Both A and C
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单项选择题
A．Mostly Chinese.B．Only sometimes the foreign language.C．Mostly the students’ language.D．Each language about half the time.
A．Mostly Chinese.
B．Only sometimes the foreign language.
C．Mostly the students’ language.
D．Each language about half the time.
单项选择题
A．Workers with overly critical supervisors.B．Children with cruel friends .C．Students with unsupportive teachers.D．All of the above.
A．Workers with overly critical supervisors.
B．Children with cruel "friends".
C．Students with unsupportive teachers.
D．All of the above.
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