单项选择题

Questions 30 to 32 are based on the passage you have just heard.

A．He knew this beforehand.
B．He judged from time zones.
C．He made such a judgment so as to Wang.
D．He gave such an explanation because he analyzed the speeds of sound and electricity.

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单项选择题

A．People marry at a much later time.B．More birth control devices and methods have been used.C．Women would rather go to study or work than have children.D．All of the above.

A．People marry at a much later time.
B．More birth control devices and methods have been used.
C．Women would rather go to study or work than have children.
D．All of the above.

Questions 30 to 32 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。

Questions 30 to 32 are based on the passage you have just heard.