单项选择题

A．They reduce a person’’s appetite.
B．They make a person less persistent in face of trouble.
C．They make a person’’s nervous system weak.
D．They make a person more vulnerable to disease.
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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.
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.
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.
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