单项选择题

A．Because the fibers of his muscles are very thick.
B．Because he has more muscles.
C．Because his muscles are made of more stringy fibers.
D．Because the number of his muscles was fixed during his childhood.
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单项选择题
A．He is seriously ill and still in hospital.B．Mary will do his work insteadC．Morrison is his doctor.D．He will go to work tomorrow.
A．He is seriously ill and still in hospital.
B．Mary will do his work instead
C．Morrison is his doctor.
D．He will go to work tomorrow.
填空题
Smokers are easy to suffer from inflammatory headaches because smoking can cause
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