单项选择题

The lead pencil is the simplest, most ___ and least expensive of all writing instruments.

A．adaptable
B．comfortable
C．convenient
D． standard
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单项选择题
If things are going badly, the optimist acts quickly, looking for __ and forming a new plan of action.
A．result
B．solutions
C．response
D．settlement
单项选择题
Some younger workers assume older workers can't keep __ with fast-changing technology and business pressures.
A．pace
B．step
C．progress
D．touch
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