单项选择题

Passage One Questions 11 to 13 are based on the passage you have just heard.

A．An artificial sun
B．The artificial stars.
C．A bird that spent its lifetime in a cage.
D．A bird that had never flown under a natural sky.

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单项选择题

单项选择题

Passage One Questions 11 to 13 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。