Allen followed his customer across the yard and stood on the step of the house,        two shopping bags. 

A．lifted

B．having lifted

C．to lift

D．lifting

急性心肌梗死的监护包括( )。

A．心电监护仪连续监护72小时

B．24小时内每小时监测心率、心律、呼吸、血压1次

C．尿量变化

D．中心静脉压及肺微血管嵌楔压变化

E．全身变化