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【单选题】
防止左心室的血液逆流至左心房的结构是A.
二尖瓣
B.
三尖瓣
C.
主动脉瓣
D.
肺动脉瓣
E.
冠状瓣
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【简答题】Every character is influenced by heredity, environment and education. But these apart, if every man were not to be a great extent the _________ of his own character, he would be a fatalist, and ______...
【单选题】Why is the man worried about the course?
A.
That David is not a serious student.
B.
That David doesn't need to worry because he has a scholarship.
C.
That David won't speak with him.
D.
That David wants to move back to his home town.
【单选题】推轮椅上下坡道的方法正确的是（）
A.
上坡时朝前直行，下坡时朝前直行
B.
上坡时使用者面朝后，下坡时朝前直行
C.
上坡时朝前直行，下坡时使用者面朝后
D.
上坡时使用者面朝后，下坡时使用者面朝后
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【单选题】The basic difference between man and animal is that man is not as__________ As animals.
A.
weak
B.
strong
C.
organized
D.
specialized
【单选题】What do we learn about the man?
A.
That he is not a student this semester.
B.
That he is not a serious student.
C.
That he is not very concerned about the woman.
D.
That he is willing to compromise.
【单选题】Why is the man worried about the course?
A.
That David is not a serious student.
B.
That David doesn't need to worry because be has a scholarship.
C.
That David won't speak with him.
D.
That David wants to move back to his home town.
【单选题】导线与导线、导线与电气设备的连接处由于接触面处理不好，接头松动，造成连接处电阻过大，形成局部过热的现象，称为_____。
A.
短路
B.
接触不良
C.
过载
D.
漏电
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