心原性晕厥最严重的原因是A．阵发性房颤 B．阵发性心动过速 C．主动脉瓣狭窄 D．原

A. they should spend sometime

B. the students are not expected

C. they had so many choices

D. many of them told me

E. many of them expressed disappointment

In my spoken English class, I asked the students about their university life. To my surprise, 小题1:. After their highly controlled(控制) high school lives, they were having difficulty getting used to (习惯) the free time in the university. When I asked them to describe their high school lives, 小题2:they got up at six in the morning and studied until ten or even later at night. Most of this time was spent doing lots of homework.

When they entered the university, in my opinion,小题3:to spend all their waking hours studying. They should also take an active part in social activities. They should learn to divide their time outside of class between sport sand clubs. What’s more, 小题4:watching TV and chatting with their roommates. But what surprised me most was that many of them did not seem happy because小题5:. They felt that they should be doing something else what ever they were doing. That’s why they were not happy.

To those students, my advice is: Get used to it and learn to make decisions for yourselves.

不论是艺术现象还是社会现象或自然现象，它们自身都具备着多种属性，（）属性只不过是其中的一种。

公司不以任何资产作担保而发行的债券是（）。

A．信用公司债 

B．保证公司债 

C．抵押公司债 

D．信托公司债