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Questions 14-16 are based on a lecture on human language. You now have 15 seconds to read Questions 14-16. How many periods of time do the researchers study on children’s language development

A．Two.
B．Three.
C．Four.
D．Five.

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单项选择题

单项选择题

Questions 14-16 are based on a lecture on human language. You now have 15 seconds to read Questions 14-16. How many periods of time do the researchers study on children’s language development 您的浏览器不支持 audio 元素。