单项选择题

Questions 17—20 are based on the following passage you will hear You now have 20 seconds to read Questions 17—20.
How many children currently live only one parent in the U.S.

A．One in three children.
B．One in four children.
C．One in five children.
D．One in six children.

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单项选择题

单项选择题

Questions 17—20 are based on the following passage you will hear You now have 20 seconds to read Questions 17—20. How many children currently live only one parent in the U.S. 您的浏览器不支持 audio 元素。