单项选择题

A．To learn how to prevent a bone disease.
B．To understand differences between bone tissue and other tissue.
C．To find out how specialized bone cells have evolved.
D．To create artificial bone tissue.
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单项选择题
A．Wearing arm weights while you are swimming.B．Jogging vigorously in one place for a long time.C．Using bicycles that require you to use both your arms and legs.D．Walking slowly while swinging your arms back and forth.
A．Wearing arm weights while you are swimming.
B．Jogging vigorously in one place for a long time.
C．Using bicycles that require you to use both your arms and legs.
D．Walking slowly while swinging your arms back and forth.
单项选择题
A．The man would understand if he had Peter’’s job.B．Peter could help him get a job on an airplane.C．Waiting on tables is an enjoyable job.D．She is tired of waiting for him there.
A．The man would understand if he had Peter’’s job.
B．Peter could help him get a job on an airplane.
C．Waiting on tables is an enjoyable job.
D．She is tired of waiting for him there.
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