单项选择题

Questions 11-13 are based on the following passage. You now have 15 seconds to read the questions 11-13. By which is the average adult covered

A．Three feet of skin.
B．Twelve yards of skin.
C．Two square feet of skin.
D．Two square yards of skin.

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单项选择题

单项选择题

Questions 11-13 are based on the following passage. You now have 15 seconds to read the questions 11-13. By which is the average adult covered 您的浏览器不支持 audio 元素。