题目内容

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

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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

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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

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The passage is most likely a part of

A. a news article
B. a preface
C. a research report
D. a journalist interview

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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______.

The core of a comet______.

Windows 2000 中，重排桌面的图标时，首先应进行的操作是

The passage is most likely a part of

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