Directions： There are 20 blanks in the following text.For each blank there are four choices marked A

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Directions： There are 20 blanks in the following text.For each blank there are four choices marked A，B，C and D.Choose the ONE that best fills the blank.

Personal computers are used by one person at a time.The largest personal computer，or PC's，can fit on a　1　.Some of these　2　have more than one microprocessor (微处理器).3　the primary processor，which is a general purpose device，a PC may have one or more processors to　4　special kinds of work.Some machines，5　，have maths processors，others have graphics (描绘) processors to help process photographs and other illustrations.Still others have　6　processors.

Office workers also use PC's that are not　7　to a network.These machines are used for　8　tasks as word processing，performing financial calculations，and organizing and　9　bodies of information called databases (数据库).People use PC's at　10　for some of the same kinds of tasks.They use word processing programs for　11　communication，financial software for household budgets (预算).Individuals also use their home computers to play　12　and to communicate　13　the internet.

Small，portable PC's are　14　with people who often work away from their desks.The　15　include laptop computers，which can be　16　on the lap； notebook computers，which are about the　17　of a loose leaf notebook； and palmtop，or handheld computers，which can be operated while　18　in the hand.Laptop and notebook computers have the same　19　as desktop computers.Palmtop computers have less power but still　20　some advanced capabilities.For example，they can process household financial data.

（　　）1.A.table　B.bench　C.desktop　D.chair

（　　）2.A.computers　B.machines　C.devices　D.PC's

（　　）3.A.Including　B.Except　C.Besides　D.With

（　　）4.A.handle　B.deal　C.work out　D.type

（　　）5.A.for example　B.by the way　C.in the other hand　D.Whats more

（　　）6.A.noise　B.voice　C.sound　D.music

（　　）7.A.tied　B.connected　C.join　D.link

（　　）8.A.these　B.such　C.different　D.same

（　　）9.A.sorting　B.dividing　C.to arrange　D.to separate

（　　）10.A.office　B.company　C.home　D.factory

（　　）11.A.personal　B.public　C.official　D.secret

（　　）12.A.games　B.jokes　C.soft wares　D.matches

（　　）13.A.in　B.across　C.over　D.above

（　　）14.A.satisfied　B.helpful　C.welcomed　D.popular

（　　）15.A.portables　B.typewriters　C.computer　D.lamp

（　　）16.A.put　B.set　C.fixed　D.held

（　　）17.A.weight　B.size　C.length　D.width

（　　）18.A.held　B.holding　C.took　D.taking

（　　）19.A.processor　B.power　C.usage　D.palm

（　　）20.A.provide　B.supplied　C.offer　D.Give