单项选择题

A．absorption
B．digestion
C．intake
D．output
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单项选择题
A．as toB．as forC．as ifD．as well as
A．as to
B．as for
C．as if
D．as well as
单项选择题
A．whichB．thatC．whatD．how
A．which
B．that
C．what
D．how
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