肝肿大伴扩张性搏动见于（）
A.严重的门静脉高压
B.尖瓣关闭不全
C.主动脉瓣关闭不全
D.肝脓肿
E.三尖瓣关闭不全
参考答案：E
作出假设是实验研究的一个重要环节，它是对问题作出各种尝试性解释。[ ]
完成句子。
1.明天你必须按时交上你的作业.
You must _________ _________ your homework on time tomorrow.
2.他经常扮成小丑来取乐.
He often __________ _________ as a clown to make fun.
3.为了赶早班车,今天早晨他起的很早.
This morning he got up very early______ _______ to catch the early bus.
4.药店位于家具店和书店之间.
The drugstore is ___________ the furniture store__________ the bookstore.
5.每天她都要用大量的时间来读书.
She __________ a lot of time __________ some books every day.
