单项选择题

A．To indicate how climbers communicated.
B．To show that climbers enjoyed many comforts.
C．To show that modern telephones work at high altitudes.
D．To emphasize how small some equipment had become.
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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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