单项选择题

Running slowly for (some) three miles every day (is proved) a good (form) of (exercise).

A．some
B．is proved
C．form
D．exercise
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单项选择题
ff you don't put the milk in the refrigerator, it may ________
A．go by
B．go off
C．go on
D．go back
单项选择题
Everything we eat and drink contains some salt; we can meet the body's need for it from natural sources without turning ________ the salt bottle.
A．up
B．to
C．on
D．over
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