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在存储管理中，将绝对地址对应的存储空闯称为（)，将逻辑地址对应的存储空间称为（)。

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在典型的计算机系统硬件结构中，CPU与内存在最里层，通过总线与第二层的（)部件相连，第三层是（)，最外层是外围设备。

记录的成组和分解技术是磁盘高速缓存的一种应用，虽然需要代价，但是具有提高（)和减少（)的优点。

把文件按组织形式进行分类，可以分为普通文件、（)和（)等三类。

_ on roofs and telegraph wires.These birds are swallows.They are 62 together because, very soon, they will be flying 63 to much warmer lands, where they will find 64 the small flying insects on which they 65.There are no such insects 66 in Britain during the winter; it is 67 cold for them.
The swallows settle, fly off, swoop, and 68 again.this they do many times, for they are making short 69 flights in order to be fit for the long journey 70 them.
71 of these migrating birds leave Britain in the autumn.They fly 72 for hundreds of miles 73 they reach the warm lands of Africa.But not all the birds get there, for many of them perish in the stormy weather they meet with 74.
In the spring of the following year they 75 the long and tiring journey back to Britain.They return to the identical barn or tree in the 76 district which they had left the 77 autumn.How do these birds find their78 there and back over such vast distances？ Nobody knows exactly 79, but it has something to do 80 winds and air currents.
61.a.being perched b.perched c.being perching d.be perched
62.a.gathering b.assembling c.waiting d.forming
63.a.to south b.the south c.to southwards d.south
64.a.a great number of b.a great deal of c.plenty of d.numerous
65.a.feed b.are fed c.eat d.rely
66.a.near b.about c.nearby d.over
67.a.too b.a bit c.very d.much
68.a.fly off b.swoop c.settle d.turn back
69.a.practical b.practicing c.practice d.practiced
70.a.in advance b.ahead of c.in front of d.in front
71.a.Swarms b.Herds c.Flocks d.Schools
72.a.firmly b.stoutly c.harshly d.steadily
73.a.until b.before c.when d.as
74.a.in the way b.on the way c.half the way d.all the way
75.a.take b.fly c.find d.make
76.a.old b.original c.familiar d.identical
77.a.before b.previous c.above going d.former
78.a.way b.path c.course d.route
79.a.why b.when c.how d.what
80.a.against b.away c.for d.with