单项选择题

The following are external signs of vitamin deficiencies except ______.

A．dry skin
B．thinner and duller hair
C．cracks at the corner of the mouth
D．purplish tongue
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单项选择题
A nutritionist does diet studies by ______.
A．asking the patient only about his general diet habit of having breakfast
B．asking the patient to recall the nutritious food he ate in the past 24 hours
C．asking the patient about how healthy he thinks he is
D．asking the patient to provide a list of his daily diet
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