单项选择题

Besides genes, our skin color has much to do with ______.

A．exercise
B．weight
C．food
D．sunshine
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单项选择题
When summer comes and the light—colored people go to the beaches, ______.
A．all of them will tan darkly
B．few of them will tan darkly
C．many of them will not tan at all
D．some of them will not tan at all
单项选择题
During the Industrial Revolution people began to like to have a tan because it was a sign of ______.
A．good health
B．great strength
C．wealth
D．youth
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