Why does Jane refuse Tom's invitation？
A. Because she wants to study for a test.
Because she wants to go swimming at the student center.
C. Because she has to do research in the library.
D. Because she is not interested in the man.
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What do we know about Ban Francisco？
A. It is a city. built in the mountains.
B. It has the world-famous bridge.
C. Visiting the city is not so easy.
D. It has no bus service.
In which city can people enjoy jazz？
A. New York.
B. New Orleans.
C. San Francisco.
D. The Golden Gate Bridge.
What do we learn about Tom？
A. That he is not a student.
B. That he is not a serious student.
C. That he is not very concerned about Jane.
D. That he is willing to compromise.
主板(也称母板或系统板)是计算机硬件系统集中管理的核心载体，几乎集中了全部系统功能，是计算机中的重要部件之一。下图所示的计算机主板上，①处是(21)，②处是(22)。
A. CPU插槽
B. 内存插槽
C. PCI插槽
D. IDE插槽
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