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.
Why do astronomers make long time exposures

A．To spend less time at their telescopes.
B．To overcome the problem of weak light.
C．To take more photographs.
D．To photograph astronomical objects without using a telescope.
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单项选择题
What was Stowe’s first published work
A．A children’s geography book.
B．A collection of travel stories.
C．A biographical sketch.
D．Uncle Tom’s Cabin.
单项选择题
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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