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Scientists have discovered a genetic defect that appears to cause deficit-hyperactivity disorder, more commonly known as hyperactivity. People afflicted with this disorder have trouble focusing their attention and controlling impulses, and tend to be rest-less and aggressive. The defect occurs in a gene that regulates the body's use of the thyroid hormone. This finding was made in continuing study organized by the National Institute of Diabetes and Digestive and Kidney Diseases in which 70 percent of children inheriting the gene were hyperactive while only 20 percent of the children not inheriting the gene were hyperactive. And although the researchers admit that this defective gene probably accounts for only a fraction of cases of hyperactivity, this discovery will allow doctors to spot newborn babies likely to have the disorder, and also to provide clues for its cause and treatment.

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Marian Anderson had a brilliant singing career which began a the age of six when she leamed spirituals' at the Union Baptis Church in her hometown of Philadelphia. Her tour of Europe in the 1920s drew vast acclaim; however, when .she returned to the United States she was still barred from performing on the American operatic stage. After she was prevented from singing in Washington's segregated Constitution Hall in 1939 Eleanor Roosevelt intervened and arranged for her to perform at the Lincoln Memorial. A crowd of 75, 000 people came to watch her sing before the Memorial. Her beautiful contralto voice was breaking down racial barriers, showing Americans that black had a profound contribution to make to Americans cultural life. Eventually, she became the first African-American singer to perform at New York's Metropolitan Opera in 1955. In her many years of touring she had to endure a racism that forced her to enter concert halls and hotels through service entrances. Her grace under this stress showed a moral perseverance that paralleled that of the famous Martin Luther King, Junior.

OOP language that create object, such as(1)and(2),are beginning to take hold as viable tools for programmers.To effectively reuse object, programmers need a place to store them such as an ODBMS or a RDBMS with object oriented extensions.
Databases that handle object data not only let user store and retrieve(3)data, but also let them store objects created by OOP languages, to facilitate rapid software development and reuse, and let them(4)new multimedia applications combining multiple data types.
RDBMS vendors have developed new extensions to exiting DB technology to accommodate the most common forms of(5)data.
(1) PASCAL (2) BASIC (3)C (4)C++
(5) FORTRAN (6) SMALLTALK (7) numeric (8) nonalphanumeric
(9) structured (10) unstructured (11) to build (12) build
(13) to be build (14) built

Electronic mail, or mail, as it is known to its many fans, has been around for over two decades. Typically, email systems support five basic functions, as described below.(1)refers to the process of creating messages and answers.(2)refers to moving messages from the originator to the recipient.(3)has to do with telling the originator what happened to the message. Was it rejected？ Was it lost？(4)incoming message is needed. So people can read their email.(5)is the final step and concerns what the recipient does with the message after receiving it。
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(1) Communication (2) Coruposition (3) Displaying (4) Disposition
(5) Network (6) Protocol (7) Reporting (8) Serving
(9) Terminating (10) Transfer

The approach we propose is a system-oriented methodology for knowledge acquisition, this orientation emphasizes ongoing documentation throughout each cycle and technique applied. Program-wide documentation is suggested, both for the purpose ofinternal(1)and for later verification and(2)efforts. The documentation system we propose includes a central "knowledge acquisition(3)" which is(4)to reflect knowledge acquisition plans, session nodes, and domain expert participation. Specifically,(5)within the database system include knowledge acquisition forms, which document plans for, and notes from, knowledge acquisition session, domain expert file, and rule content forms.