Why did the agent call on the speaker so early in the morning?
A. His telephone went out of order.
B. The buyers had to leave soon.
C. He began to work at 8 a.m.
D. He had made an appointment with her at 8 a.m.
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According to the passage, what were dogs trained for in the past?
A. For protection against other animals.
B. For protection against other dogs.
C. Just for fun.
D. For the purpose of guarding the house.
What is the main idea of this passage?
A. The city can be a lonely place.
B. Life in the West can be very dangerous.
C. People in the West are fond of animals.
D. The dog is a useful and friendly animal.
操作系统的资源管理功能是＿。
A. 运算管理、控制管理、存储管理、磁盘管理
B. 硬盘管理、软盘管理、存储管理、文件管理
C. 处理器管理、存储器管理、设备管理、文件管理
D. 程序管理、文件管理、编译管理、设备管理
操作系统是一种＿。
A. 操作者所用的软件的总称
B. 软件和硬件的统称
C. 操作者所直接接触的硬件设备的总称
D. 系统软件
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