单项选择题

Questions 11—13 are based on the following passage. You now have 15 seconds to read Questions 11—13. In the USA, how many children smoke every day

A．two fifths
B．63 percent
C．About one in five
D．63,000

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单项选择题What can we learn from the first paragraph

Questions 11—13 are based on the following passage. You now have 15 seconds to read Questions 11—13. In the USA, how many children smoke every day 您的浏览器不支持 audio 元素。