单项选择题

Science is still ______ of the causes of many kinds of cancer.

A．ignorant
B．unconscious
C．conscious
D．informed
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单项选择题
All the firemen in the city were ______ to fight against the big fire.
A．called in
B．called off
C．called up
D．called on
单项选择题
What matters ______ not winning but participating.
A．are
B．to be
C．was
D．is
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