题目内容

Every year a large number of young people leave school and begin work. Some (21) jobs on farms or in industry. Others accept positions in the (22) services. Many seek post in business or a trade. A few with skills in art or music apply for work in these fields. Their level of education (23) affects their range of possible openings. Many farms, for instance, only select excellent (24) for training as future executives. They will not consider applications from people with only (25) records of achievement at school. What factors influence the choice of a career The information (26) on this is uncertain but it is probable that finance, working conditions and prospects of improvement are the most significant considerations. It seems apparent that (27) which retain their employees give them satisfaction in these respects. A (28) investigation of the motives which operate in the selection of employment would prove a profitable topic for research. Employers who would (29) the assistance of the findings to enlist and maintain stable staff might be induced to (30) in the project.

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窗体的控件种类很多，但其作用及________各不相同。

Where can the two speakers probably be

A. In a bookstore.
B. In a gift shop.
C. In a school.

计算字段是指根据一个或多个表中的一个或多个字段并使用_建立的 _。

TapeStore: A NEW TAPE SIORAGE SYSTEMTapeStore is a new kind of tape storage system which can store up to 6,000 computer tapes. No other tape storage system can hold as many computer tapes as TapeStore. The tapes look exactly like video cassettes. Many hundreds of data files can be stored on each tape, up to a maximum of 500 million bytes of data. If you stored the same amount of information on paper, you would need nearly 4.5 billion printed pages.The machine is a tall black box with a mechanical arm. The machine is 2.5 metres high and 3.0 metres wide. This is how it works. Each tape has a code printed on it. YOU feed the code number into TapaStore, which then looks for the code. As soon as TapaStore locates the cede, the arm reaches in and pulls out the tape.The system is very fast. It takes the mechanical arm about 10 seconds to find the tape it is looking for. The machine then searches the tape to extract the required file, and this take less than a minute. A human technician would have to locate and remove the tape by hand; and could take at least an hour to find the right file on the tape.Some of the world’s biggest companies, including banks, insurance companies, airlines, telephone companies, utilities and computer centres, have bought the system. They like it particularly because the system guarantees the security of their data.TapeStore was originally developed in Canada and is now being marketed world-wide. In Europe alone, 750 have already been installed at a cost of 480,000 dollars each. The TapeStare system is popular with big companies because（）

A. it costs less than a human operative.
B. the information it stores is valuable.
C. they know that their data is saf