In the text below some words are missing. Drag words from the box below to the appropriate place in the text. To undo an answer choice, drag the word back to the box below the text.
下面的文本缺了一些词。请把词框里的词拖到文中合适的位置；要撤销选择，把词拖回文本下方的词框即可。
A new report by environmental The Nature Conservancy lays out how trees could pave the way to cleaner air and cooler cities. Using information on forest cover paired with air pollution data and population for 245 cities, researchers found that trees have the biggest health in densely populated, polluted cities like Delhi, Karachi and Dhaka. The Conservancy and the C40 Cities Climate Leadership Group presented the findings of their global survey this week at the American Public Health Association meeting in Denver, Colorado.
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