肝脏的血液供应来自门静脉的约占（）
A．30-35％
B．40-45％
C．50-55％
D．60-65％
E．70-75％
参考答案：E
Speech is ______ heard when it is given in a clear voice just slightly louder than normal.
A．hardly
B．less
C．completely
D．best
