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阅读下面材料,在空白处填入1个适当的单词或括号内单词的正确形式。

Lions,tigers and other animals are staying awake at night1.(avoid)human beings,a new study finds.

Scientists have known that human activities can lead to changes in nature.Many animals may move around less or travel to far places to keep away2.people.By being awake at night,animals can also be on guard against possible enemies and spend less time3.(look)for food.

The latest research found even activities like farming and camping can4.(fright)animals and cause them to become more active at night.5.had been studied were lions in Tanzania,tigers in Nepal and monkeys in Brazil.Researchers compared6.(careful)how much time those animals were active at night in areas of human activities,such as hunting and farming.7.was human activities that caused an increase of about 20 percent in night time activities,even in creatures that usually sleep at night.Results8.(publish)in the journal Science two months ago.

The new findings are9.(usual)because no one else has looked at it in such detail before Ecologist Marlee Tucker was10.(surprise)that any kind of human activities is enough for animals to see people as a threat.

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