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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单项选择题
Millions of Americans flock to their drugstores to buy vitamins and minerals, ______ that these pills can help to prevent serious illnesses.
A．convincing
B．convinced
C．to convince
D．to be convinced
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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