单项选择题

A．Mother and father.
B．Mother and son.
C．Teacher and student.
D．Two students.
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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.
单项选择题
A．Dark blue.B．Dark green.C．White.D．Black.
A．Dark blue.
B．Dark green.
C．White.
D．Black.
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