单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．When they are born.
B．When they are ten months old.
C．When they are one year old.
D．When they are two years old.

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单项选择题

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Passage One Questions 26 to 28 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。