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  3. So-called "green roofs"—urban rooftops covered with grasses, plants and other types of greenery—are becoming increasingly popula

So-called "green roofs"—urban rooftops covered with grasses, plants and other types of greenery—are becoming increasingly popula

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问题     So-called "green roofs"—urban rooftops covered with grasses, plants and other types of greenery—are becoming increasingly popular around the world. In France, newly built commercial rooftops must have either greenery or solar panels, according to a recent law. The logic is obvious: Green roofs can reduce the retention(滞留)of【C1】______in urban areas, help to cool down buildings and thereby lower their energy use, and even pull some carbon dioxide from the air and【C2】______it back into plant growth. Plus, they look cool.
    But the psychological benefits of green roofs to busy office workers may also be【C3】______, according to new research. In a study published in the journal Environmental Psychology, the University of Melbourne’s Kate Lee and a group of colleagues found that interrupting a tedious, attention-demanding task with a 40-second "microbreak"—in which one【C4】______looks at a computerized image of a green roof—improved focus as well as subsequent【C5】______on the task.
    The research adds to a growing scientific【C6】______on the health advantages—psychological and otherwise—of being exposed to views of nature in urban settings, for instance through the presence of parks or trees. Research in this area is so far along, in fact, that researchers are considering whether it might be possible to【C7】______the right "dose" of nature that people need to receive in order to actually【C8】______significant health benefits.
    Other psychological benefits of nature views have also been【C9】______in recent literature. In one study, research subjects who viewed a 12-minute nature documentary before playing a game that involved managing a fishery resource engaged in more【C10】______behavior.
    A)accidentally F)feed K)performance
    B)appearance G)give L)reap
    C)captured H)heat M)simply
    D)different I)identify N)substantial
    E)easily J)literature O)sustainable
【C4】
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