单项选择题

In the quest to find a __________ for cancer, scientists must draw on a collective information base.

A．symptom
B．diagnosis
C．cause
D．remedy
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单项选择题
We have a firm belief in our ability to overcome the obstacles which__________ us.
A．formulate
B．orientate
C．confront
D．saturate
单项选择题
The fear of smallpox, which terrorized the eighteenth century, has no __________ today.
A．monopoly
B．successor
C．analogy
D．substitute
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