单项选择题

A layman in this field ______ this type of approach to improving work efficiency.

A．originated
B．speculated
C．generated
D．manufactured
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单项选择题
According to a war correspondent, one could sense nothing but flashes and bangs during the ______ of the war.
A．climax
B．summit
C．pitch
D．maximum
单项选择题
The inaccessible transportation ______ the development of the local business.
A．intervened
B．insulated
C．hampered
D．hoisted
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