单项选择题

Why does Jack do yard work

A．To earn money for school.
B．To keep his family’’s yard looking nice.
C．To be able to work outdoors.
D．To get exercise while working.
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单项选择题
A surgeon who has worked 40 hours in a row without sleep______.
A．can still provide quality medical care
B．will remain alert because he is used to it
C．may ignore the potential risk of insufficient sleep
D．should be fired if he continues the medical operation
单项选择题
There is room in the new class because two students______.
A．went home
B．dropped the course
C．transferred
D．graduated
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