一般认为静息时以左心室射血分数(LVEF)判断异常的标准是()
A．<40%
B．<45%
C．<50%
D．<55%
E．<60%
参考答案：C
We have already _ much water to the people in the south of China. [ ]
A. given in
B. given up
C. given away
D. given out
昏迷病人禁止擦洗舌面和硬腭部以免触及咽部引起恶心。
