单项选择题

Passage Two
Questions 29 to 31 are based on the passage you have just heard.

A．At 5 years old.
B．At 6 years old.
C．At 7 years old.
D．It’s not clear.

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单项选择题

单项选择题

Passage Two Questions 29 to 31 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。