题目内容

下列关于“I／O端口的编址方式”的说法中，错误的是()。

A. 当I／O端口采用独立编址方式，I／O端口的地址译码较简单，寻址速度快
B. 当I／O端口采用独立编址方式，CPU需要设置专门的区分访问主存或I／O的信号引脚
C. 当I／O端口采用统一编址方式时，CPU只能用访问主存的指令来访问I／O端口
D. 当I／O端口采用统一编址方式时，CPU能够访问的主存空间变少

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下列关于I／O端口的说法中，错误的是()。

A. CPU向I／O设备发出命令是通过对I／0接口中命令端口进行写操作来实现的
B. 一个I／O端口要么是命令／状态端口，要么是数据端口
C. 一个I／O端口或者是输人端口，或者是输出端口，或者是双向端口
D. 只有当I／O端口采用统一编址方式，CPU才需要提供专门的I／O指令

America. The telephone book lists restaurants for each city according to name, area of the city, or kind of food. Restaurants in large cities vary greatly in price. Many restaurants post their menus in the window so you can have some idea of the price and kind of food before you enter. If the menu is not posted, and you are uncertain about how expensive the place is, ask to see a menu before you are seated at a table, or else just ask about the price range. Appearances from the outside can be misleading—what looks like a small, informal restaurant may really be very expensive, and what looks like a large, expensive restaurant may be very reasonable.
You can get a meal for about $5 or slightly more if you eat in bars or coffee shops ,but in most city restaurants you should expect to pay $20 to $30 a person for dinner, with drinks extra.