systems perform. basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and(75)on the disk, and controlling peripheral devices such as disk drives and printers.A．OperationB．OperatorC．Operatin

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systems perform. basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and(75)on the disk, and controlling peripheral devices such as disk drives and printers.

A．Operation

B．Operator

C．Operating

D．Operate

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1.Now she is free ________ the control of her parents.(A) out(B) away(C) from(D) off

2.OSPF is enabled on router A. You execute the following command on router A and receive theaccompanying output:RouterAping 224.0.0.5 repeat1Type escape sequence to abort.Sending 1, 1 00 - byte ICMP Echos to 224.0.0.5, timeout is 2 seconds:Reply to request 0 from 10.100.100.1, 4 ms10.100.100.1 is the IP address of a loopback interface on router A.What can you conclude about router A?（）A. Only the router A loopback interface is parti cipating in the OSPF routing processB. None of the router A interfaces are participating in the OSPF routing processC. Router A is using the loopback interface IP address as its OSPF router IDD. Router A does not have any reachable OSPF neighbors

3.资料：The personal computer was a revolution in information technology that spawned a $50 billion hardware business, with another $30 billion in software and peripherals （eg. mouse, keyboard, printer, etc.） by 1991. During its short 15 years, the industry evolved through three successive periods. During its first 5 to 6 years, it was characterized by explosive growth and multiple, small competitors vying for a piece of the market. From 1981 to 1985, the industry became a battle for standards and retail shelf space. The third era was one of increasing fragmentation. From 1986 through 1991-1992, new manufacturers from around the world grabbed from the industry leaders as new channels of distribution emerged and product innovation as well as revenue growth slowed. During the early years of the industry, venture capital in the U.S. encouraged the entry of new firms that offered products in every conceivable shape and size. By 1980, new entrants flooded the market, prompting distinct standards and unique technical features. Almost every firm had a different configuration of hardware and software. The first PC had relatively little speed or memory. However, even these early computers allowed managers to perform tasks that were very time consuming.What was impossible during the early years of the industry? A.Sharing applications between machines. B.Programming on the computer. C.Writing contracts on the computer. D.Buying keyboards and printers.

4._________[A] deliver [B] carry [C] perform. [D] apply

systems perform. basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and(75)on the disk, and controlling peripheral devices such as disk drives and printers.A．OperationB．OperatorC．Operatin

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