题目内容：
Upgrade a computer You can Upgrade a computer to enhance it ’s 1 .. For many upgrades,you will need the assistance of an experienced computer 2 erson.Upgrading usually refer to replacing an old or obsolete computer with a newer one to improve the efficiency of the computer.Upgrading can also include adding a new 3 ,such as a tape drive or DVD-ROM drive,to increse the capabilities of the computer. You should always determine the cost of an upgrade before performing it.If you are planning a major upgrade,such as the system board or CPU ,it may be less expensive to purchase a new computer. Increasing the 5 of memory in a computer is one of the most effetive upgrade you can perform.Doubling the existing memory in a computer can significantly increase its performance. 1.A.cost B.height C. performance D.experience 2. A.repair B.check C.administer D.keep 3.A.member B.tape C.drive D. component 4.A.replace B.replacing C.to replace D.replaced 5. A. amount B.cost C.speed D.quality
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