单项选择题


A．conversion
B．incidence
C．concealment
D．degree
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单项选择题
A．slighterB．fainterC．lessD．more
A．slighter
B．fainter
C．less
D．more
单项选择题
Arctic explorers may catch colds when ______.
A．they are working in the isolated arctic regions
B．they are writing reports in terribly cold weather
C．they are free from work in the isolated arctic regions
D．they are coming into contact again with the outside world
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