单项选择题

A．John is more likely to develop lung cancer.
B．Mary is more likely-to develop lung cancer.
C．John and Mary have the same chance to develop cancer.
D．Neither John nor Mary has the chance to develop cancer.
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单项选择题
A．Governments.B．Shopkeepers.C．Doctors.D．Civil servants.
A．Governments.
B．Shopkeepers.
C．Doctors.
D．Civil servants.
单项选择题
A．The advantages of traditional surveying methods.B．Using satellites to communicate with mountain climbers.C．Obtaining new information about a mountain.D．Controlling satellites from the top of a mountain.
A．The advantages of traditional surveying methods.
B．Using satellites to communicate with mountain climbers.
C．Obtaining new information about a mountain.
D．Controlling satellites from the top of a mountain.
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