The core of a comet______.
A. has no solid form
B. wanders like a frozen lump when it's far out in space
C. requires the warmth of the sun to survive
D. is always followed by a long tail
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Windows 2000 中，重排桌面的图标时，首先应进行的操作是
A. 用鼠标右键单击桌面空白处
B. 用鼠标右键单击“任务栏”空白处
C. 用鼠标右键单击已打开窗口空白处
D. 用鼠标右键单击“开始”按钮
The passage is most likely a part of
A. a news article
B. a preface
C. a research report
D. a journalist interview
Which of the plan does NOT belong to Microsoft？
A. Prepare to invest $ 200 million on the e-books.
B. Cooperate with the British Library to digitize some 25 million pages.
C. Introduce some new services to Amazon.
D. Launch the MSN Book Search next year.
以下叙述正确的是
ASCII码和国标码都是对符号的编码
B. 一个ASCII码由七位二进制数构成
C. ASCII码是每四位一组表示一位十进制数字
D. 计算机不能直接识别十进制数，但能识别二进制数和十六进制数
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