单项选择题

Questions 19 to 21 are based on the passage you have just heard.

A. Birds use their beaks to clean their feathers.
B. Preening is very important to birds.
C. The habits of birds are interesting.
D. How birds clean their feathers.
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单项选择题
D
单项选择题
A. Why his parents wanted to go to Gettysburg.B. Why his family’s vacation plans changed ten years ago.C. Where his family went for a vacation ten years ago.D. When his family went on their last vacation.
A. Why his parents wanted to go to Gettysburg.
B. Why his family’s vacation plans changed ten years ago.
C. Where his family went for a vacation ten years ago.
D. When his family went on their last vacation.
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