单项选择题

Peter had difficulty swimming across the lake, but he finally succeeded on his fourth ______.

A．attempt
B．process
C．display
D．instance
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单项选择题
The country needs a ______ government. We have had three prime ministers in a year.
A．stationary
B．changeless
C．constant
D．stable
单项选择题
______ is a branch of mathematic scientist.
A．Statistic
B．The statistic
C．Statistics
D．The statistics
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