单项选择题

A．researches
B．polls
C．surveys
D．investigations
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单项选择题
Which of the following is true about left-handers
A．Left-handers represent less than l0 percent of the general population in 1977.
B．Left-handers represent more than 23 Percent of the general population in 1977.
C．Left-handed people can not use the ordinary tools as well as the right-handed.
D．Left-handed people are not as creative as right-handed people.
单项选择题
At what age the hand preference is clearly marked
A．Three years old.
B．Before the age of three.
C．Six and above.
D．From three to six years old.
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