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 passage is mainly about ______.
A．the importance of diet
B．the need of iron
C．adolescents' eating habits
D．blood hemoglobin
单项选择题
Which of the following is NOT mentioned in the third paragraph
A．Group work gives pupils the opportunity to learn to work together with others.
B．Pupils also learn to develop their reasoning abilities.
C．Group work provides pupils with the opportunity to learn to be capable organizers.
D．Pupils also learn how to participate in teaching activities.
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