单项选择题

The greatest benefit one can get from exercise is when ______.

A．the workout involve various jumps
B．one does not use an elevator but climbs stairs
C．one walks to run most of the errands
D．one switches from being inactive to active
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单项选择题
Who served in the Second World War
A．Bill Clinton and Bob Dole.
B．Bob Dole and George Herbert Walker Bush.
C．George Herbert Walker Bush.
D．George Herbert Walker Bush and Bill Clinton.
单项选择题
Which of the following may count as deliberate workout
A．Housework.
B．Lawn-mowing.
C．Table tennis.
D．Out-of-the-gym activities.
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