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D.By designing a system and predicting. 33.What can we know about the study according to the text? A.Researchers made eight rings with different gases added. B.Almost no insects are found to enter all the polluted rings. C.Air pollution blocked the sight of insets to find their food. D.Scents from flowers are severely disturbed by the polluted air. 34.What is paragraph 4 mainly about? A.The inability of insects distinguishing scents. B.The main reasons for insects'population decreasing. C.Insects are able to use smells to perform multi-tasks. D.Air pollution becomes the biggest threat to insects.