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
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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.
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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