The manager raised his voice __________ he could be heard clearly.

A．in order to

B．in order that

C．so as to

D．make sure

关于甲亢拟血管系统表现哪项是错误的（）。

A、心动过速

B、早搏

C、脉压差减小

D、第一心音增强

E、臂舌循环时间缩短