单项选择题

A．One.
B．Two.
C．Three.
D．Seven.
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单项选择题
A．One of the student’s friends.B．The student’s parents.C．Either his employer or his university.D．Both his employer and his university.
A．One of the student’s friends.
B．The student’s parents.
C．Either his employer or his university.
D．Both his employer and his university.
填空题
Why does the author say Antarctica is an important part of Earth’s system
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