左心室的心壁比右心室的心壁厚时原因是[ ] A．左心室比右心_爱下问搜题

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问题选择题

左心室的心壁比右心室的心壁厚时原因是[ ]

A．左心室比右心室输出的血量多

B．主动脉口比肺动脉口小

C．左心室输送血液的距离比右心室的长

D．右心室比左心室大

答案

C

选择题

Stay awake！You should know that it________to sleep in class.[ ]

A．doesn’t permit

B．is not permitted

C．will not be permitted

D．was not permitted

选择题

-- How much pork is there in the fridge? ---__________We need to buy some,

A．Nothing

B．No one

C．Nobody

D．None