单项选择题


Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now listen to the passage.
What is one advantage of photographing the skies

A．The cost of equipment needed is reduced.
B．Fewer data need to be analyzed.
C．The images can be studied by different astronomers.
D．The natural colors of astronomical objects can be captured.
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单项选择题
Why does the woman suggest that the man visit her office in the afternoon
A．She isn’t there in the morning.
B．Her assistant isn’t there in the morning.
C．She won’t have the forms he needs until the afternoon.
D．She isn’t as busy in the afternoon.
单项选择题
Why do astronomers often use photographic plate
A．To decrease the time it takes to photograph objects.
B．To avoid using a telescope.
C．To sharpen the color of what they observe.
D．To obtain images of distant objects.
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