单项选择题

Techniques to harness the energy of the sun are being developed.

A．convert
B．store
C．utilize
D．receive
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单项选择题
The company recommended that a new petrol station (should) be built here.
A．ordered
B．insisted
C．suggested
D．demanded
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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