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
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