By the time you have finished this book,

—— Have you seen＿＿＿pen? I left it here this morning．

—— Is it＿＿＿black one? I think I saw it somewhere．

A．a； the

B．the； the

C．the； a

D．a； a

线性表的储存结构主要分为顺序储存结构和链式储存结构。队列是一种特殊的线性表，循环队列是队列的______存储结构。

请自己组织语言，概括下面这段文字的主要内容。（不超过15个字）

　　欧盟委员会健康风险科学委员会发表报告指出，如果5年内每周使用随身听5天且每天以高音量收听音乐平均超过一个小时的话，那么5%至10%的使用者将面临永久性失聪的危险。最近几年，欧盟的随身听特别是MP3的销售数量猛增，约有5000万到1亿人特别是年轻人在使用随身听，因此有必要对随身听对人体的危害进行调查并采取措施，以保护青少年不受随身听和其他类似装置的损害。

_______________________________________________________

Wes Smith, CFA, refers many of his clients to Bill Towers, CPA, for accounting services. In return, Towers performs routine services for Smith, such as his tax returns, for no charge. Towers has just become a member of CFA Institute. With this development, Towers must:()

A. reveal to the prospects referred by Smith that he performs services for Smith, along with the estimated value of those services.

B. only reveal to the prospects referred by Smith that he performs services for Smith.

C. reveal nothing about his relationship with Smith since they are now both members of CFA Institute.

下列属于治安管理机构的是（）

A.公安派出所

B.治安保卫委员会

C.治安拘留所

D.居民委员会