单项选择题

The author recommends that young people ______.

A．check blood hemoglobin yearly
B．be oh a strictly vegetarian diet
C．lose weight
D．do some more studies on hemoglobin
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单项选择题
The author argues that a teacher's chief concern should be the development of the student's ______.
A．personal qualities and social skills
B．total personality
C．learning ability and communicative skills
D．intellectual ability
单项选择题
By held back (Line 1) the author means ______ .
A．made to remain in the same classes
B．forced to study in the lower classes
C．drawn to their studies
D．prevented from advancing
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