全国100所名校最新高考冲刺卷英语2023届Y1
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both gases.A final pair of rings was a control and received
no
added gases.The tests took place over two summers.
During
each field season,the scientists counted how many times insects
visited the flowers in each ring.
"The results were much more serious than we thought,"
Ryalls says."Adding both the diesel exhaust and ozone pollution
caused up to 90 percent less insects to be able to find the flowers
that they need for food,he says.This was in comparison to the
pollutant-free rings.In some cases,only some 30 percent of the pol-
linating insects even entered the circles with pollution.
Many insect populations have been falling due to changes in
land use,climate change and exposure to pesticides.This study
focused on insects finding flowers.But insects also use smells for
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