单项选择题

A. Doing homework. B. Fine, thank you.
C. Very good. D. Writing a book.
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单项选择题
In total darkness, doves ______.
A. use landmarks

B. don’t know which way to fly
C. fly back home

D. wait for the stars to appear
填空题
Why did the author find it difficult to sleep ______ at night was extremely loud.
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