单项选择题

Passage Three
Questions 32 to 35 are based on the passage you have just heard.

A．The population of elderly people.
B．Nuclear weapon.
C．Violence in crime.
D．Living standards.

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Why have some underground houses been pulled down

Passage ThreeQuestions 32 to 35 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。