从供选择的答案中，选出应填入下面英文语句叙述中{ }内的正确答案，把编号写在答卷的对应栏内。
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.
供选择的答案：
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】
Examda提示参考译文：对用户来说，微内核技术有希迪帜茉谛矶嘤布教ㄉ弦浦驳目焖佟⒔舸蘸拖冉牟僮飨低场Ｕ庑┎僮飨低晨梢远ㄖ苹允褂没Э稍诘ジ鑫⒛诤嘶∩显诵卸喔霾僮飨低澈陀τ贸绦颉?/P>
基于微内核的系统之所以能够提供此灵活性是因为核心的操作系统功能与大量用程序、特征和扩展功能是分离的。它们分层加于核心功能上，其结果是使更新和维护操作系统更加容易了。因为开发人员不必在每次加入一个新特色时都修改核心。
【答案】A：② B：③ C：④ D：① E：①
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