单项选择题

Debates within the social sciences have ______ an intellectual space which has.

A．constrained
B．occupied
C．dominated
D．restricted
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The best way to introduce a new user to a computer system is to draw an ______ between the computer and some situation familiar to the user.
A．image
B．analogy
C．imitation
D．axis
单项选择题
Scientists are claiming a major ______ in the treatment of cancer and AIDS.
A．distinction
B．breakthrough
C．identification
D．interpretation
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