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
No sooner had I closed the door than somebody started knocking ________ it.
A．on
B．with
C．to
D．for
单项选择题
Young ________ he is, he knows what is the right thing to do.
A．that
B．as
C．although
D．however
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