窗帘：隐私
A．文件：机密
B．日记：心情
C．消防栓：火警
D．防护栏：安全
参考答案：D
解析：窗帘是保护隐私的，防护栏是保护安全的，故选D。
肝血流约占心排血量的（）
A.3%
B.7%
C.25%
D.10%
E.15%
I'll be out for some time. ______ anything important happens, call me up immediately.
A．In case
B．As if
C．Even though
D．Now that
