单项选择题

What of the following can be the best title for the passage

A．Building Strong Bones.
B．The Hard Lesson of Bones.
C．Strong Bones for Somebody.
D．Bones of Childhood and adolescence.
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单项选择题
What does the writer worry
A．A cracked shinbone caused by too much running on hard pavement.
B．His suffering from a kind of women's disease at the age of more than 54.
C．His being close to a disease that causes older people to shrink in height and break bones easily.
D．His bones are weaker than average women.
单项选择题
The backpack's electricity comes from ______.
A．the gears with battery-powered devices
B．the motion of the whole backpack while one walks
C．a mechanism with gears
D．an electrical generator
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