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Section CDirections: In this section, you will hear a passage three times. When the passage is read for the first time, you should listen carefully for its general idea. When the passage is read for the second time, you are required to fill in the blanks with the exact words you have just heard. Finally, when the passage is read for the third time, you should check what you have written.Several holidays are (1)__________ to the Americans. Columbus Day, which is celebrated on the second Monday in October to honor the discovery of North America; Fourth of July, which is Independence Day; Washington's Birthday, which is celebrated on the third Monday in February to honor the first President of the United States; and Thanksgiving. Thanksgiving (2)__________ from the days of the early New England colonists who were having difficulty (3)__________ in the New Land. Without the help of the native American Indians, the (4)__________ would have died. The Indians showed the colonists how to hunt wild turkeys and grow corn. In the fall, the Indians and colonists (5)__________ for a feast to honor their friendship. Today, Americans follow the tradition by inviting friends and relatives for a turkey dinner on the fourth Thursday of November.

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下列描述中是正确的。

A. 控制器能够识别、解释和执行所有的指令及存储结果
B. 计算机主要由输入输出单元、控制器、存储器和算术逻辑单元构成
C. 所有的数据运算都在控制器中完成
D. 三者都正确

冯.诺依曼提出了()的概念,以此概念为基础的各类计算机通称为冯.诺依曼机。

A. 二进制运算
B. 有存储信息的功能
C. 运算速度快
D. 存储程序

完整的计算机应包括______。

A. 运算器、存储器、控制器;
B. 外部设备和主机;
C. 主机和实用程序;
D. 配套的硬件设备和软件系统;

运算器由许多部件组成,其核心部分是________。

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