单项选择题

The children who were selected for the experiment gained more IQ points than the others because they were ______.

A．more clever
B．taught by different teachers
C．taught with new materials and methods
D．given more encouragement by their teachers
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单项选择题
What was tested in this experiment
A．The influence of IQ test.
B．The influence of selected teachers.
C．The influence of teacher expectations.
D．The influence of teaching methods and materials.
单项选择题
John waited at the bus-stop for nearly half an hour ______ the bus finally arrived.
A．when
B．as
C．before
D．while
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