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  3. 30 years ago, anyone blaming loneliness for physical illness would have been laughed at. But as scientists studied different pop

30 years ago, anyone blaming loneliness for physical illness would have been laughed at. But as scientists studied different pop

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问题     30 years ago, anyone blaming loneliness for physical illness would have been laughed at. But as scientists studied different populations, loneliness kept emerging as a risk factor. In one study, California researchers followed 4 700【B1】______ of Alameda County for ten years, starting in 1965. At first, the participants reported their key sources of companionship and【B2】______the time they devote to each other. During the study, the people who reported the least social contact died at【B3】______ three times the rate of those reporting the most. The source of companionship didn’t matter, but time spent with others was【B4】______. Since then, researchers have studied men, women, soldiers, and students from countries all over the world. And the same【B5】______ keeps emerging. Women who say they feel isolated go on to die of cancer at several times the【B6】______rate. College students who report "strained and cold" relationships with their parents【B7】______ extraordinary rates of hypertension(高血压)and heart disease decades later. Heart-attack【B8】______who happen to live by themselves die at twice the rate of those who live with others. For those of us who are still healthy, the lesson should be obvious. It’s clear that【B9】______others can help our bodies thrive. It’s equally clear that we’re growing more isolated. In 1900, only 5% US households【B10】______one person living alone. The proportion reached 13% in 1960, and it stands at 25% today.
【B4】
选项
答案critical
解析 空格所在的分句中有主语time，系动词was，由此判断，空格处需填入一个词作表语。结合录音可知，答案为critical，意为“关键的，重要的”。
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