单项选择题

According to the passage, lung cancer ______.

A．is the major cause of death between the ages of 35 and 55
B．is most often caused by smoking
C．never affects non—smokers
D．has nothing to do with smoking

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单项选择题

By held back (Line 1) the author means ______ .

A．made to remain in the same class
B．forced to study in the lower class
C．drawn to their studies
D．prevented from advancing

单项选择题

In the passage the author's attitude towards mixed—ability teaching is ______.

A．critical
B．questioning
C．approving
D．objective