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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单项选择题
Which of the following can be inferred from the passage
A．Advances in medical science made disease unable to regulate human population growth any longer in many parts of the world.
B．Medical cures have prolonged life but upset the reproductive age group by increasing many populations.
C．In Australia, the use of the myxomatosis virus hardly controlled the rabbit population with increasing resistance to the disease.
D．It is discovered all strains of virus can parasitize and kill the bacteria without harming the organism that the bacteria has infected.
单项选择题
Why is the close planting of trees of the same species avoided in modern orchards and forests
A．Because mixed forests and orchards are the recognized procedures these days.
B．Because trees of same species may cause the spread of disease.
C．Because modern orchards and forests are more specialized.
D．Because trees planted crowdedly do not have enough room to develop their roots.
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