[填空题]was discovered as early as 1524.

[填空题]was discovered as early as 1524.

[填空题]Early Modem English was recognizable to the Early Modem speaker during the period of the
15th century to the 17th century, although at that time the word order and______was still slightly different.

[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