更多"Scientists have established an inte"的相关试题:
[填空题]Nowadays, scientists still have not made huge progress on the research of earthquake because they have not fully understood what cause earthquakes.
[填空题]Scientists will have to ______ (提出增加世界粮食供应的新方法).
[填空题]Scientists will have to ______ (提出增加世界粮食供应量的新方法).
[填空题]Scientists will have to ______________ (提出提高世界粮食供应量的新方法).
[填空题] Scientists have discovered that plants themselves produce many poisonous chemicals for (36) ________ against insects. But insects have developed ways of (37) ________ with them and, in fact, have been eating plants for about 250 million years. Now insects are using these same (38) ________ to deal with man-made poisons—insecticides. This is why (39) ________ of insects to insecticides has developed so (40) ________.
What should be done Scientists studying the problem suggest that farmers use less insecticides. At the moment, farmers (41) ________ spray crops as a (42) ________ 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 (43) ________ of two or three insecticides at once. (44) __________________________.
The most surprising suggestion, perhaps, is that at certain times of the year, (45) ___________________________. The new insects will mate with those which