单项选择题

The tendency of the human body to reject foreign matter is the main obstacle to successful organ transplantation.（）

A．factor
B．constituent
C．barrier
D．break

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单项选择题
Many students today display a disturbing willingness to choose institutions and careers on the basis of earning potential.（）

A．offensive
B．depressive
C．tiresome
D．troublesome
单项选择题
Whenever you need Tom, he is always there whether it be an ear or a helping hand, so you can always lean on him.（）

A．count on
B．benefit from
C．stand for
D．stick to
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