隋代（）等人编写的（）专门描述病情、分析病理，对诸多病症确定了病名。
参考答案：巢元方；《诸病源候论》
He knew nothing about it _____ I told him.[ ]
A. since
B. because
C. until
D. after
The human beings have polluted the environment seriously. It is time the United Nations must take some measures.
A．take
B．taking
C．to take
D．took
