单项选择题

Questions 11 to 13 are based on the following talk on hygiene. You now have 15 seconds to read Questions 11 to 13. What is said about the best distance between a book and our eyes when reading

A．It is 14 inches.
B．It is hard to figure out.
C．It varies from person to person.
D．It depends on lighting conditions.

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单项选择题

单项选择题

Questions 11 to 13 are based on the following talk on hygiene. You now have 15 seconds to read Questions 11 to 13. What is said about the best distance between a book and our eyes when reading 您的浏览器不支持 audio 元素。