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问题 单项选择题

下列叙述中，错误的是

A．计算机硬件主要包括：主机、键盘、显示器、鼠标器和打印机5大部件

B．计算机软件分为系统软件和应用软件两大类

C．CPU主要是由运算器和控制器组成

D．内存储器中存储当前正在执行的程序和处理数据

答案

参考答案：A

解析：[分析] 计算机硬件系统包括主机(中央处理器，内存储器)和外部设备(外部存储器、输入设备、输出设备、其他设备)。

单项选择题

识别超声伪像的临床意义，下列哪项是错误的()

A．避免误诊

B．避免漏诊

C．避免误诊和漏诊

D．可以提示某些病变或异常

E．只有理论价值，无实际意义
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单项选择题

The history of African—Americans during the past 400 years is traditionally narrated (1) an ongoing struggle against (2) and indifference on the part of the American mainstream, and a struggle (3) as an upward movement is (4) toward ever more justice and opportunity.

Technology in and of (5) is not at fault; it’s much too simple to say that gunpowder or agricultural machinery or fiber optics (6) been the enemy of an (7) group of people. A certain machine is put (8) work in a certain way—the purpose (9) which it was designed. The people who design the machines are not intent on unleashing chaos; they are usually trying to (10) a task more quickly, cleanly, or cheaply, (11) the imperative of innovation and efficiency that has ruled Western civilization (12) the Renaissance.

Mastery of technology is second only (13) money as the true measure of accomplishment in this country, and it is very likely that by (14) this under-representation in the technological realm, and by not questioning and examining the folkways that have (15) it, blacks are allowing. (16) to be kept out of the mainstream once again. This time, however, they will be (17) from the greatest cash engine of the twenty-first century. Inner-city blacks in particular are in danger, and the beautiful suburbs (18) ring the decay of Hartford, shed the past and learn to exist without contemplating or encountering the tragedy of the inner city.

And blacks must change as well. The ways that (19) their ancestors through captivity and coming to freedom have begun to loose their utility. If blacks (20) to survive as full participants in this society, they have to understand what works now.

16（）

A.them

B.us

C.themselves

D.ourselves
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