单项选择题

Mainstream economists profess much puzzlement over the failure of the rate of productivity growth to ______ so far in this decade.

A．accelerate
B．prevail
C．aggregate
D．precede
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单项选择题
The company formulated a package of ______ for assessment of employees' performance.
A．thresholds
B．Partitions
C．warrants
D．criteria
单项选择题
We can ______ over the ways and means before the construction work starts.
A．reckon
B．speculate
C．ponder
D．presume
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