单项选择题

Dr. Bergsten also has served on the senior staff of the National Security Council, 1969-71, and as a senior fellow of the Brookings Institution, another prominent Washington "think-tank'.

A．permanent
B．famous
C．president
D．important
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单项选择题
The library already subscribes to at least one of the materials related periodicals published by them.
A．period
B．science
C．magazines
D．novels
单项选择题
The salesman stood up for his product when challenged.
A．defended
B．sold
C．spoke of
D．stood out
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