单项选择题

Questions 11-13 are based on the following talk about napping, you now have 15 seconds to read questions 11-13. According to the speaker, the sleep pattern of a baby is determined by

A．its genes.
B．its habit.
C．its mental state.
D．its physical condition.

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单项选择题

Questions 11-13 are based on the following talk about napping, you now have 15 seconds to read questions 11-13. According to the speaker, the sleep pattern of a baby is determined by 您的浏览器不支持 audio 元素。