单项选择题

A．Secretary-Boss.
B．Client-Lawyer.
C．Student-Teacher.
D．Patient-Nurse.
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单项选择题
A．Man is also a kind of animal.B．There have been men for more than a million years.C．Like any other animals, man slowly changed through time.D．There were men a few million years ago.
A．Man is also a kind of animal.
B．There have been men for more than a million years.
C．Like any other animals, man slowly changed through time.
D．There were men a few million years ago.
单项选择题
A．Artificial hearts.B．Telescopes.C．Microscopes.D．Radio telescopes.
A．Artificial hearts.
B．Telescopes.
C．Microscopes.
D．Radio telescopes.
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