单项选择题

Dump sewage into oceans and rivers is a serious form of pollution.（）

A．Having dumped sewage
B．Being dumped sewage
C．Dumped sewage
D．Dumping sewage

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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
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
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