单项选择题

A．How children learn to speak.
B．Why apes can learn a few words.
C．Man’’s brain helps him to learn to speak.
D．What happens when men speak.
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单项选择题
Americans believe that they can realize their personal values only ________.
A．when given equality of opportunity
B．through doing business
C．by protecting their individual freedom
D．by way of competition
单项选择题
The Canadian study found that illness in the family was a greater cause of absenteeism than work to do at home .
A．Y
B．N
C．NG
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