单项选择题

Living things are ______ cells, and cells do not grow to more than twice the size they were at first.

A．made from
B．made up of
C．made up from
D．made of
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单项选择题
Every director needs an assistant that he can ______ to take care of problems that may occur in his absence.
A．count of
B．count for
C．count on
D．account for
单项选择题
No sooner had I closed the door than somebody started knocking ______ it.
A．on
B．with
C．to
D．for
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