专升本习题练习

专升本考试易错题(2018/11/20)
1题: The telephone______four times in the last hour, and each time it______for my roommate.
A.has rung; was
B.has been ringing; is
C.had rung; was
D.rang; has been
【单选题】:      

2题: 下列关于正常心电图的叙述错误的是( )
A.P波代表两心房去极化
B.QRS波代表两心室去极化
C.ST段很稳定,表明心室肌处于静息状态
D.PR间期延长说明房室传导阻滞
E.ST段表明心室各部分之间没有电位差存在
【单选题】:        

3题: They are busy ______ in their lessons before the exam.
A.going after
B.going over
C.going by
D.going ahead
【单选题】:      

4题: Anything dropped falls towards the center of the earth because of ______.
A.weight
B.gravity
C.density
D.attraction
【单选题】:      

5题:

【单选题】:      

 

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