假设某CPU的时钟周期为5ns，所访问的主存的存取周期为60ns，为了正确读出主存中的指令和数据，还需在总线周期中插入2个等待状态，则此CPU的总线周期应该为( )。
A. 10ns
B. 20ns
C. 40ns
D. 50ns
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______ can be a "treat", according to the text.
A. Candy
B. Flour
C. Noise
D. Costume party
Why does Brazil seldom send female swimmers to the Olympics
A. Because successful women swimmers tend to be big, strong, hard and bulky, but Brazilian culture says that women should be soft.
Because Brazilian women don't like swimming and running.
C. Because Brazil's beauty standards accept less fat, expecially in female buttocks and hips.
D. Because Brazilian girls are encouraged to take part in public activities.
下面表示段定义结束的命令是( )。
A. ENDP
B. ENDS
C. EMDM
D. END
下面所列的文件的物理结构中，不利于文件长度动态增长的文件物理结构是( )。
A. 索引结构
B. Hash 结构
C. 顺序结构
D. 链接结构
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