单项选择题

In 1861 it seemed inevitable that the Southern states would break away from the Union.

A．strange
B．certain
C．inconsistent
D．proper
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单项选择题
Techniques to employ the energy of the sun are being developed.
A．convert
B．store
C．use
D．receive
单项选择题
He works in a sports centre instructing people in the use of the gym equipment.
A．helping
B．teaching
C．informing
D．ordering
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