单项选择题

Questions 11～13 are based on the following monologue. What is the skin

A．Appreciated by most people.
B．An organ of the body.
C．An inactive organ.
D．Relatively unimportant.
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单项选择题
What is the main reason that the man runs every day
A．To think out some difficult problems.
B．To do some cross-country running.
C．To finish a course in physical training.
D．To keep fit and healthy.
单项选择题
What is the normal internal temperature of the body
A．97 to 99 degrees.
B．79 to 81 degrees.
C．79 to 99 degrees.
D．71 to 79 degrees.
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