主板性能的多少,往往取决（）芯片与主板上的一些专用芯片。
A. CPU
B. 南桥
C. 北桥
D. 内存
" For" is often used after verbs to express __________.
A. purpose
B. reason
C. in place of
D. direction
You must depart _______ England at once.
A. for
B. at
C. to
D. in
2. Mike ________ early retirement
A. opted for
B. chose for
C. stood for
D. selected of
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