单项选择题

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

A. Mars. B. Venus.
C. Jupiter. D. The Moon.
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单项选择题
C
单项选择题
A. They hide themselves. B. They keep silent. C. They stay away from other birds. D. They make some signs.
A. They hide themselves. B. They keep silent.
C. They stay away from other birds. D. They make some signs.
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