题目内容
（请给出正确答案）
A．scarce
B．minimum
C．short
D．seldom
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更多“This kind of plants is getting…”相关的问题
If plants gives off more smells, what kind of weather is going to come？
It is going to ______.
How do all food chains break？
A．One kind of animals is eaten up.
B．One kind of plants is destroyed.
C．One kind of animals eats another.
D．One of the links is destroyed.
Why was this kind of technology effective？
A．It could ignore the plants without problems so as to save the pesticide.
B．It could make the plants yield more.
C．It could effectively kill the insects.
D．It could save the time for the farmer to work.
Some plants and animals develop superior characteristics so that they may______.
A．help others of their kind get food，shelter and other things needed
B．get into the biological process of adaptation
C．become better adapted to the environments than others of their kind
D．lead to the evolution and production of more and more organisms
A、allodiploid
B、allotriploid
C、autotriploid
D、allotetraploid
E、autotetraploid
What conclusion can be drawn from the scientists observation？
A．Insects have developed some sort of resistance to man-made poisons.
B．Insects have been eating plants for about 250 million years.
C．Farmers sometimes use a combination of two or three insecticides at once.
D．New insects mate with insects which survived from a certain kind of insecticide.
A．A flowering tree pollinated by only a few insect species.
B．A kind of insect-pollinated vine producing few flowers.
C．A wind-pollinated flowering tree that is short-lived.
D．A flowering shrub pollinated by a large number of insect species.
A．In areas where two successive crops are raised per year, protecting the first crop from a virus will generally protect the second crop from that virus as well.
B．By repeatedly attacking plants that are genetically altered to become virus-resistant, the virus often becomes less lethal to plants that are not genetically altered in that way.
C．Plants that are genetically altered to become virus-resistant often pass virus-resistant genes on to their offspring.
D．Plants that arc made genetically resistant to one kind of virus often acquire resistance to related viral strains as well.
E．Plants that are made genetically resistant to one kind of virus are then more susceptible to infection by unrelated viruses.
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 at-tract 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.
Scientist hope that these and other measures will post-pone the day when farmers and scientists will have to stand by while new super-bugs which may be resistant to all poi-sons invade our farms and devour our crops.
What conclusion can be drawn from the scientists' observation？
A．Insects have developed some sort of resistance to man-made poisons.
B．Insects have been eating plants for about 250 million years.
C．Farmers sometimes use a combination of two or three insecticides at once.
D．New insects mate with insects which survived from a certain kind of insecticide.
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