By saying "The cost is staggering, the grief is overwhelming, and there is no end in sight" (Para. 5), the Bellevue doctor suggests that ______.
A. people in the country should donate more money to treat the AIDS patients
B. those who deal with AIDS patients every day have lost all hope
C. doctors and others have lost their hope in treating the AIDS patients
D. AIDS patients should not give up hope although the disease is hard to cure
What can be inferred from the passage？
A. Senior citizens are more likely to contract AIDS compared with young people.
B. Many AIDS victims suffer not only physically, but also emotionally and psychologically.
C. People will refuse donated blood in the future because it is likely to contain AIDS virus.
Doctors have lost their hope to see an eventual cure for the AIDS patients.
Which of the following best states the theme of the passage？
A. There is no good news on AIDS.
B. The total economic cost for AIDS patients is staggering.
C. Nationwide efforts must be made to find a cure for AIDS.
D. AIDS has a deep impact on American society.
A．不需要增加一个新的关系模式B．不需要增加一个新的关系模式，只需要将1端的码插入多端C．需要
A. 不需要增加一个新的关系模式
B. 不需要增加一个新的关系模式，只需要将1端的码插入多端
C. 需要增加一个新的选课关系模式，该模式的主键应该为课程号
D. 需要增加一个新的选课关系模式，该模式的主键应该为课程号和学生号
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