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【单选题】Unless we can find a way to ________ nature and then invest in protecting it, our basic life-support systems are going to collapse.
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【单选题】The blizzard (暴风雪) moved south,turning into an icy rain that ________ the airports for three days.
【单选题】In this introduction we have diagnosed some of the causes of the illness and, in the following chapters, we will draw attention to its various unpleasant ________.
【单选题】In those days, divorce under any circumstances was socially unacceptable and there was great ________ in the family who went through it.
【单选题】Every time she talked about being rejected in her hunt for a job, she seemed on the ________ of tears, and I would quickly switch the conversation to another topic.
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