单项选择题

The plan would require two, or possibly more, class periods for its fulfillment.

A．execution
B．excursion
C．expansion
D．extinction
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单项选择题
Great works are performed not by strength but by persistence.
A．permanence
B．proliferation
C．perseverance
D．predominance
单项选择题
In 1986 the country initiated restrictions on the use of pesticides.
A．instituted
B．constituted
C．prosecuted
D．distributed
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