单项选择题

What does the author mean by "held back" ( Line 1, Para. 1 )

A．Made to stay in the same class.
B．Obliged to study in the lower class.
C．Prevented from advancing.
D．Concentrated on their studies.
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单项选择题
In the passage the author's attitude towards mixed-ability teaching is ______.
A．approving
B．critical
C．interested
D．objective
单项选择题
According to the passage, which of the following statements is true
A．The general public has been fully conscious of the consequences of glohal warming.
B．Political measures have been taken to deal with the consequences of global warming.
C．The team of professionals are only indifferent to the consequences of global warming.
D．The experts are well aware of the consequences of global warming.
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