单项选择题

Questions 15-18

A．There are not equal numbers of males and females.
B．The sample pool is too small.
C．The questionnaire survey fails to include enough questions.
D．The students didn’t give definite answers to the questions.
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单项选择题
It can be inferred that Americans being approached too closely by Middle Easterners would most probably ______.
A．stand still
B．jump aside
C．step forward
D．draw back
单项选择题
A．About sixty.B．About fifteen.C．About sixteen.D．About five.
A．About sixty.
B．About fifteen.
C．About sixteen.
D．About five.
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