单项选择题

A．Working for oil companies.
B．Working for medical organizations.
C．Working for UN inspection teams.
D．Working for NGOs.
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单项选择题
A．the Antarctic is not a suitable place for human beings to surviveB．people cannot explore the Pole area from airC．the airplanes would one day replace dogs and sledgesD．dogs and sledges need no human care
A．the Antarctic is not a suitable place for human beings to survive
B．people cannot explore the Pole area from air
C．the airplanes would one day replace dogs and sledges
D．dogs and sledges need no human care
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