For users, microkernel technology promise { A }, compact, and sophisticated operating systems that are typically { B }across a range of hardware platforms. These operating systems will be customizable to let users run multiple operatin system and application "per-Sonalities" on top of a single microkernel { C } .Microkernel-based systems can provide this flexbility because the core operating.

　　System functionc are { D } from the large number of utilities, features and extension that are layered on top of them. As a result, updation and maintaining operating system is easier, since developers don't have to modify the { E } every time they must add a new feature.

　　供選擇的答案：

　　A：①slow ②fast ③quickly ④speed

　　B：①moveable ②made ③portable ④use

　　C：①bases ②foundations ③systems ④foundation

　　D：①separate ②connected ③compared ④selected

　　E：①core ②center ③heat ④utility

　　【解析】

　　參考譯文：對(duì)用戶來(lái)說(shuō)，微內(nèi)核技術(shù)有希望實(shí)現(xiàn)能在許多硬件平臺(tái)上移植的快速、緊湊和先進(jìn)的操作系統(tǒng)。這些操作系統(tǒng)可以定制化，以使用戶可在單個(gè)微內(nèi)核基礎(chǔ)上運(yùn)行多個(gè)操作系統(tǒng)和應(yīng)用程序。

　　基于微內(nèi)核的系統(tǒng)之所以能夠提供此靈活性是因?yàn)楹诵牡牟僮飨到y(tǒng)功能與大量用程序、特征和擴(kuò)展功能是分離的。它們分層加于核心功能上，其結(jié)果是使更新和維護(hù)操作系統(tǒng)更加容易了。因?yàn)殚_發(fā)人員不必在每次加入一個(gè)新特色時(shí)都修改核心。

　　【答案】A：② B：③ C：④ D：① E：①