单项选择题

Why so few people are left-handed ______.

A．has nothing to do with heredity
B．is not known by scientists
C．has little to do with the working of their brains
D．is that left-handers are mainly twins

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单项选择题

Which of the following is NOT true

A．If both parents are left-handed, about 50% of their children will be so.
B．The greater part of left-handers have right-handed parents.
C．One in ten of Americans are left-handed.
D．Most of us will favor the right.

单项选择题

By saying the conclusion to be drawn are obvious (Para 4, Lines 1 - 2), the writer means that ______.

A．women's inconstancy in their choice of clothing is often laughed at
B．women are better able to put up with discomfort
C．men are also exploited greatly by fashion designers
D．men are more reasonable in the matter of fashion