单项选择题

A．A snowstorm.
B．An earthquake.
C．A traffic accident.
D．A hurricane.
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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.
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.
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.
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