单项选择题

A．The survey received a low rate of return.
B．The sample selected was not representative.
C．The questionnaires were too difficult.
D．The results of the survey were against the public opinion.
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单项选择题
A．Children are unfamiliar with each other’s problems.B．Children are deprived of the opportunity to enter the adult world.C．There are too many segregated schools.D．Boys and girls do not study together and fail to know each other.
A．Children are unfamiliar with each other’s problems.
B．Children are deprived of the opportunity to enter the adult world.
C．There are too many segregated schools.
D．Boys and girls do not study together and fail to know each other.
单项选择题
A．She will fly directly to her destination.B．She must change at Jacksonville.C．She has to stay overnight at Albany.D．She will take a two-hour flight to Albany.
A．She will fly directly to her destination.
B．She must change at Jacksonville.
C．She has to stay overnight at Albany.
D．She will take a two-hour flight to Albany.
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