单项选择题

A．They made them by knives.
B．They found adequate stones.
C．They used bones of animals.
D．They made tools by hitting stone against stone,
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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.
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.
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.
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