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.
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单项选择题
A．Walk around the apartment for dangerous signs.B．Check the water and electricity to see if they are working.C．Make sure there are good locks on all the windows and doors.D．Talk to other people who rent apartments in the same building.
A．Walk around the apartment for dangerous signs.
B．Check the water and electricity to see if they are working.
C．Make sure there are good locks on all the windows and doors.
D．Talk to other people who rent apartments in the same building.
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