单项选择题

A．Examinations.
B．The loss of a job.
C．Death in a family.
D．A divorce.
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单项选择题
A．Mother and father.B．Mother and son.C．Teacher and student.D．Two students.
A．Mother and father.
B．Mother and son.
C．Teacher and student.
D．Two students.
单项选择题
A．He wanted to prevent himself from suffering from vitamin B12 deficiency.B．He was seriously ill with vitamin B12 deficiency.C．He .wanted to cure his family members of an inherited disorder.D．He was curious about the latest medical development.
A．He wanted to prevent himself from suffering from vitamin B12 deficiency.
B．He was seriously ill with vitamin B12 deficiency.
C．He .wanted to cure his family members of an inherited disorder.
D．He was curious about the latest medical development.
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