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  3. Owning a cat can reduce the risk of heart attacks and strokes by more than a third, researchers havefound. Scientists said that

Owning a cat can reduce the risk of heart attacks and strokes by more than a third, researchers havefound. Scientists said that

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问题     Owning a cat can reduce the risk of heart attacks and strokes by more than a third, researchers havefound. Scientists said that having a cat helped to【B1】______ stress and anxiety, which is known to helpprotect against heart disease by lowering blood pressure and reducing the heart rate. The 10-year study looked at 4 435 adults【B2】______ between 30 and 75, about half of whom owned a cat. The【B3】______, presented at a stroke conference in America, showed that 3. 4% of the cat owners【B4】______a heart attackover ten years. Among the group who had never owned a cat, the rate was 5. 8%. Cat owners still had a muchreduced chance of developing strokes or heart attacks when researchers【B5】______other factors known totrigger heart disease, including high cholesterol(胆固醇)levels, smoking and diabetes. Prof. Adnan Qureshi,from the Minnesota University, who【B6】______ the study, said he was surprised by the【B7】______ ofthe effect that owning a cat appeared to have. The【B8】______ explanation may be that cat ownershipreduces stress and anxiety and subsequently reduces the risk of heart disease. He【B9】______that one reasoncould be that stroking the pet could cut the level of stress-related hormones in the blood. Reducing stress is known to help protect against heart disease by lowering blood pressure and reducing the heart rate. ButProf. Qureshi【B10】______that the type of person who owned a cat was usually already fairly stress-free andat low risk of heart disease.
【B6】
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解析 由空格所在位置可以推断出，空格所在的who引导的非限制性定语从句缺少谓语，因此空格中应填入一个动词或词组。结合录音可知，答案是carried out，意为“完成，实施”。
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