Smoking and drinking are regarded as _____in some countries because they dono good to health.
A. vices
B. habits
C. customs
D. copies
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The news has not yet been officially _____by the government.
A. struck
B. confirmed
C. founded
D. pointed
What _____ did you watch on television last night?
A. wave
B. frequency
C. channel
D. tunnel
文件、管理文件的软件及数据结构的总体（）
A. 实现虚拟存储
B. 保存系统文档
C. 保存用户和系统文档
D. 实现对文件的按名存取
文件的逻辑组织将文件分为记录式文件和（）
A. 索引文件
B. 流式文件
C. 字符文件
D. 读写文件
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