单项选择题

The relative stability of the human population has been upset by ______.

A．the proportion of the reproductive age group
B．the influenza epidemic
C．advances in medical science
D．the Black Death in Europe
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单项选择题
The problem with the reading course as mentioned in the first paragraph is that ______.
A．it is one of the most difficult school courses
B．students spend endless hours in reading
C．reading tasks are assigned with little guidance
D．too much time is spent in teaching of reading
单项选择题
The teaching of reading will be successful if ______.
A．teachers can improve conditions at school for the students
B．teachers can enable students to develop their own way of reading
C．teachers can devise the most efficient system for reading
D．teachers can make their teaching activities observably
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