我国乙型肝炎病毒表面抗原主要的亚型是 A．adr和adw B．ayr和ayw C．a

品种适宜，农业技术措施得当，果蔬的采前品质好，耐贮藏。

通过会谈、问卷或各种调查表等方式对人的某些心理行为特点进行研究的方法是()

A．观察法

B．实验法

C．测验法

D．调查法

E．个案法

E

　　　Scholars and students have always been great travelers. The official case for “academic mobility” is now often stated in impressive terms as a fundamental necessity for economic and social progress in the world, and debated in the areas of Europe, but it is certainly nothing new. Serious students were always ready to go abroad in search of the best teachers and the most famous academies; in search of the purest philosophy, the most effective medicine, the likeliest road to gold

　　Mobility of this kind meant also mobility of ideas, their moving across borders, their simultaneous  (同时发生的)impact upon many groups of people. The point of learning is to share it, whether with students or with colleagues; one thinks that only eccentrics have no interest in being credited(相信) with a striking discovery, or a new technique. It must also have been comforting to know that other people in other parts of the world were about to make the same discovery or were thinking along the same lines, and that one was not quite alone, faced by question, ridicule or neglect.

　　In the twentieth century, and particularly in the last 20 years, the old footpaths of the wandering scholars have become vast highways. The vehicle which has made this possible has of course been the aeroplane, making contact between scholars even in the most distant places immediately available, and providing for the very rapid transmission of knowledge.

　　Apart from the vehicle itself, it is fairly easy to identify the main factors which have brought about the recent explosion in academic movement. Some of these are purely quantitative and require no further mention: there are far more centres of learning, and a far greater number of scholars and students.

　　In addition one must recognize the very considerable increase of all kinds of subjects, particularly in the sciences, which by widening the total area of advanced studies has produced an enormous number of specialists whose particular interests are precisely defined. These people would work in some isolation if they were not able to keep in touch with similar isolated groups in other countries.

71.It can be concluded from the passage that"academic mobility"_____.

A.means the friendship formed by scholars on the trip

B.is a program carried out by governments

C.has been put great emphasis on in the world

D.means going abroad in search of the best teachers

72.The word "eccentric" underlined in the second paragraph most probably means_____.

A.a rather strange person                              B.a person of no exceptional ability

C.an ambitious person                                  D.peculiar or unusual

73.In the eyes of the author,what happens to a scholar who shares his ideas with his      

colleagues?

A.He risks his ideas being stolen.                   B.He gains recognition for his achievement

C.He is considered as an eccentric.                 D.He is credited with a striking discovery.

74.According to the passage,the recent growth in air travel has meant that_____.

A.travel around the world becomes realistic and affordable

B.more students from remote areas can attend universities

C.all kinds of information can be shared by more people

D.scholars can meet each other more easily

75.The author thinks that it's important for scholars to be able to travel because_____.

A.their laboratories are in remote places

B.there is too much stress at universities

C.their fellow experts are spread across the world

D.there are so many people working in similar fields

书面表达（满分25分）

假设你是李华,你的朋友Jenny寄给你的生日礼物并向你询问如何保持健康。请你给她发一个邮件提些建议。内容要点如下:

1. 注意合理饮食。多吃鱼、肉、豆类等,特别是新鲜蔬菜和水果, 不要吃太多甜食。

2. 注意锻炼身体。劳逸结合, 多参加体育活动。

3. 保证充足的睡眠。不要熬夜,每天至少睡8个小时。

注意:

1.词数:100左右;

2.可适当增加细节,以使行文连贯;3.邮件的开头已为你写好。

Dear Jenny,

How nice to hear from you! In your letter you asked me how to keep healthy.

Yours, friendly

Li Hua

用户平均停电次数AITC-1指标反映出统计期间内，供电企业预安排停电和故障发生（）

A、频次

B、时间

C、概率