单项选择题

Which of the following is NOT cited as a possible risk factor（）

A．High in cholesterol.
B．Conjugal affection.
C．Eating fatty foods.
D．Being under stress.

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单项选择题

How many of the Americans are left-handers（）

A．10%.
B．12%.
C．50%.
D．84%.

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