单项选择题

Questions 17—20 are based on the following passage. You now have 20 seconds to read Questions 17—20.
When do most child poisonings happen

A．When the child can walk.
B．Aged from eight to nine.
C．Aged from four to six.
D．Aged from one to three.

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单项选择题

单项选择题

Questions 17—20 are based on the following passage. You now have 20 seconds to read Questions 17—20. When do most child poisonings happen 您的浏览器不支持 audio 元素。