心脏右前斜位摄片，服钡的目的是观察（） A.右心房压迫食管情况 B.右心室压迫食管情

阅读理解。

　　People in different countries have different hobbies around the world. For example, in America

people's favorite hobby is watching TV in their spare time. It is the main entertainment for American to

watch TV at least one hour in a day. 96% of American see watching TV as their first hobby. The second

one is going to the cinema or doing some sports. Next it is reading or gardening.Except these, fishing is

also a very popular hobby.

　  In England,it's quite different.People there like to go to the flea market (跳蚤市场). They like to

go there to see if there is something new. In addition, Englishmen like drinking tea.

　 Russians like reading very much. Wherever you go, you will see the people who are reading

carefully. Germans like reading as well. According to a survey, Germans read 11 books on average

in 2006.

1. How many kinds of hobbies that Americans have are mentioned in this article?

A. Four.

B. Five.

C. Six.

D. Seven.

2. What is the first hobby for Americans?

A. Watching TV.

B. Going to the cinema.

C. Doing some sports.

D. Reading.

3. Where do Englishmen like to go in their spare time?

A. Garden.

B. Flea market.

C. Library.

D. Cinema.

4. The people in _____ like reading.

A. Russian and German

B. Russia and Germany

C. America and England

D. England and Germany

5. The people in _____ like drinking tea.

A. America

B. England

C. Russia

D. Germany

如果把带电量为C的点电荷从无穷远移至电场中的 A点，需克服电场力做功J。试求：

（1）q在A点的电势能和在A点的电势（取无穷远处电势为零）。

（2）q未移入电场前A点的电势是多少？

首届世界环保大会是在（）年举行的

A.2009

B.2008

C.2010

D.2012

右侧上颌第二磨牙根尖片显示，在X线片右下角有一圆钝三角形高密度影，有可能是以下哪一种正常颌骨解剖结构（）

A.上颌窦

B.翼钩

C.颧骨

D.下颌骨喙突

E.下颌骨外斜线

柏拉图将世界分为（）和可知世界。

A.善的世界

B.美的世界

C.可欲世界

D.可见世界