单项选择题

A．When a patient is at an old age.
B．When a patient is very young.
C．When a person doesn’t take foods containing vitamins.
D．When a patient stops vitamins injections.
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单项选择题
A．From themselves.B．From the other people.C．From their parents only.D．From schools.
A．From themselves.
B．From the other people.
C．From their parents only.
D．From schools.
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