公安部开发的KILL．软件是用于计算机病毒的( )的软件。
A. 分析和统计
B. 检测
C. 检测和清除
D. 报案
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中国教育科研计算机网的英文简称是（）。
A. CERNET
B. INTERNET
C. NCFC
D. ISDN
下面描述有关PowerPoint演示文稿播放的控制方法，其中( )是错误的。
A. 可以用键盘控制播放
B. 可以用鼠标控制播放
C. 右击鼠标，幻灯片可切换到“下一张”而不能切换到“上一张”
D. 按“↓”键切换到“下一张”，按“↑”键切换到“上一张”
According to the author, the department stores of the 19th century ______.
A. played a role in the spread of popular culture
B. became intimate shops for common consumers
C. satisfied the needs of a knowledgeable elite
D. owed its emergence to the culture of consumption
We can infer from Dr Myers and Dr. Worm's paper that ______.
A. the stock of large predators in some old fisheries has reduced by 90%
B. there are only half as many fisheries as there were 15 years ago
C. the catch sizes in new fisheries are only 20% of the original amount
D. the number of larger predators dropped faster in new fisheries than in the old
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