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    【题目】The computer system____ suddenly while he was searching for information on the Internet.

    A. broke out B. broke in

    C. broke up D. broke down

    【答案】D

    【解析】

    试题分析：考查break的短语。选项A意为战争或自然灾害等突然爆发；选项B意为闯入；选项C意为分手、分解；选项D意为抛锚，身体垮掉，生意失败，崩溃，谈判失败等意思。本句句意为：当他在网上搜索信息时，计算机系统突然……。根据句意，选择D最为恰当，表示系统崩溃。

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