Word中对于从图形文件中插入进来的图片，进行编辑操作的对象是
A. 图片整体
B. 其中的图形元素
C. 其中的基本元素
D. 其中的一个像素点
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We learn from the text that amateur astronomers______.
A. began their discovery earlier than the professionals
B. tend to be the leaders in the area of astronomy
C. have some advantages in discovering new comets
D. established some theories on how comets come into being
Halley's comet is mentioned in Paragraph 2______.
A. to introduce some famous historical events
B. to explain some traditional beliefs about comets
C. to demonstrate the harm it has done to man
D. to show its significance to human history
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
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
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