下列哪一种属于长效局麻药()A．普鲁卡因 B．利多卡因 C．丁卡因 D．丙胺卡因 E

Since the 1950s, most of the stars of pop music have come from Britain and America. Howver, in the last ten years, when many different kinds of music have established themselves on the pop scene, more and more stars have come from other countries.

Pop music changes all the time and new stars appear and become famous. For a musician to stay popular and still produced good, original music over a long period of time, is a sign of true star.

Most stars start their careers in a simple way---- playing in unknown night clubs or dance-hall where people want to dance to the music, not listen to it. They may have continued doing this for many years untill they get a “break”---- a chance to perform in a well –known place or get a recording contract. To become a star is the aim of every singer or musician and the dream of many a pop-crazy teenager.

However a group or star makes it to the top, they can be sure that their lives will change once they are successful. Ordinary teenagers living at home with their parents may suddenly find themselves rich enough to buy their own houses. An established superstar may be able to buy several.

Despite the large amount of money that are earned, life at the top is not easy for many stars.. The pop scene is hard work and many stars need to spend a lot of time away from home. For a lot of them, this means they have no home life and their personal relationships suffer. Despite great public success, life at the top can be very lonely.

小题1:Since the 1950s,most of the stars of pop music have come from______.

A．America

B．America and Britain

C．America and Europe

D．other countries小题2:According to the passage， a “break” may mean a chance to ______.

A．perform in a well-known concert

B．get a recording contract

C．play in dance-halls

D．meet a lot of pop-crazy teenagers小题3:If a star becomes successful,.he ______ according to the passage.

A．will live at home with their parents

B．will have an easy life because of the larger amount of money earned

C．may have a happy home life and good person relationships

D．may have a lonely life

利用所学的化学反应写化学方程式：

（1）有黑色氧化物生成的氧化反应______；

（2）生成两种单质的分解反应______；

（3）有催化剂参加的分解反应______；

（4）固体与气体生成另一种气体的化合反应______．

应收账款账户的期初余额为借方2000，本期借方发生额1000，本期贷方发生额8000，该账户的期末余额为( )。

A．借方3000

B．贷方8000

C．借方5000

D．贷方5000

航空快递业务

通过对水下抛石的探摸可了解局部淘刷、走失、坍塌的范围和尺度，并约估（）。

A.长度

B.宽度

C.厚度

D.缺失工程量