Unix系统中，用（）命令可以监控系统缓存命中率。
A.sar-m
B.sar-b
C.sar-u
D.sar-d
参考答案：B
照样子，在括号里填上合适的词语。
例：(清新)的空气
( )的枝叶 ( )的羽毛 ( )的孩子
( )的乌云 ( )的天鹅 ( )的笑容
Everyone at the meeting agreed to the suggestion _______ a new bridge _______ built across the river.
A．that; have been
B．which; would be
C．as; should be
D．that; be
