单项选择题

What can we infer from the passage

A．Human's future could be depended on advance in medical science.
B．We could introduce certain kind of disease to control the number of some species.
C．Human could control diseases.
D．Introduction of the myxomatosis could control rabbit population in the world.
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单项选择题
Why did the introduction of myxomatosis into New Zealand as a means of rabbit control fail
A．Because the nature of myxomatosis is evil.
B．Because the species of flea and mosquito that transmit the disease are absent in this country.
C．Because there are too many rabbits.
D．Because the myxomatosis virus bas drastically reduced.
单项选择题
Why is the mixed planting of trees of the same species advocated in modern orchards and forests
A．Because mixed forests and orchards are the recognized procedures these days.
B．Because trees of same species may spread disease.
C．Because orchards and forests are modern.
D．Because trees planted crowdedly do not have enough room to develop their roots.
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