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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单项选择题

We had to _____a lot of noise when the children were at home.

A．go in for
B．hold on to
C．put up with
D．keep pace with

单项选择题

Agriculture was a step in human progress ______ which subsequently there was not anything comparable until our own machine age.

A．in
B．for
C．to
D．from

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