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．A short period of fair weather and mild days.B．No definite time of beginning or ending.C．Its end signals winter’’s start.D．Soft yellow or orange skies.
A．A short period of fair weather and mild days.
B．No definite time of beginning or ending.
C．Its end signals winter’’s start.
D．Soft yellow or orange skies.
单项选择题
What do we know about Mark from the passage
A．Mark has been transferred to another job because of his poor work.
B．Mark prefers credit to his own interest.
C．Mark has pleasant personality and plays a key role in the office.
D．Mark will have a very promising future career.
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