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What conclusion can be drawn from the scientists’ observation?
What conclusion can be drawn from the scientists’ observation?
admin
2011-02-28
51
问题
What conclusion can be drawn from the scientists’ observation?
Scientists have discovered that plants themselves produce many poisonous chemicals for defense against insects. But insects have developed ways of dealing with them and, in fact, have been eating plants for about 250 million years. Now insects are using these same mechanisms to deal with man - made poisons—insecticides. This is why resistance of insects to insecticides has developed so rapidly. What should be done? Scientists studying the problem suggest that farmers use less insecticides. At the moment, farmers regularly spray crops as a precaution against problems that are caused by large numbers of pests. They should, instead, spray only where pests have actually been seen. Secondly, farmers could use a combination of two or three insecticides at once. To survive, the insects would need to become resistant to two or more insecticides at the same time. The most surprising suggestion, perhaps, is that at certain times of the year, farmers should actually try to attract insects onto the crops they are trying to protect. The new insects will mate with those which survived from a certain kind of insecticide and will lessen the latter’ s resistance to it. Scientists hope that these and other measures will postpone the saying when farmers and scientists will have to stand by while new super - bugs which may be resistant to all poisons invade our farms and devour our crops.
选项
A、Insects are the most adaptable creatures.
B、Insects would be out of control if nothing were done about the current situation.
C、Insects will someday devour all plants on the Earth.
D、Insects have developed resistance to both botanical and artificial poisons rapidly.
答案
B
解析
这是主旨推断题,需要从整个的篇章去驾驭。全文要说明的是,昆虫会逐步适应最毒的农药。C是过于夸大了;A中的most是文中没有出现过的信息。
转载请注明原文地址:https://kaotiyun.com/show/2rtd777K
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