单项选择题

In how many of the years shown was the number of widgets sold at least three times the number of widgets sold in 1960？（）

A．Four
B．Three
C．Two
D．One
E．None

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单项选择题

Conspiracy theories commonly revolve around the concept that an individual or an entire organization has, for a myriad of reasons, （） events or a series of events in order to fool others, as in the theory that the moon landings were actually events staged in Earth.

A. devised
B. manipulated
C. ignored
D. plotted
E. exposed

单项选择题

The percent decrease in average number of production hours per widget from 1990 to 2000 was approximately？（）

A．44%
B．36%
C．34%
D．32%
E．27%

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