2. 外语
  3. Dogs really are our best friends, according to a Swedish study that says canine ownership could reduce heart disease. A study o

Dogs really are our best friends, according to a Swedish study that says canine ownership could reduce heart disease. A study o

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问题     Dogs really are our best friends, according to a Swedish study that
says canine ownership could reduce heart disease. A study of 3. 4
million people between the ages of 40 and 80 found that having a dog
was associated with a 23% reduction in death from heart disease and a
20% higher risk of dying from any cause over the 12 years of the study.【S1】________
Previous studies have suggested dogs release social  isolation and【S2】________
depression—both linked to an increased risk of heart disease and early death.
    Dog owners show better responses to stress, and have higher levels
of physical activity and slight lower cholesterol levels. The American【S3】________
Heart Association was sufficiently swayed by a review of dozens of
studies to release a statement in 2016 say that owning a dog "was【S4】________
probably" associated with a reduced risk of heart disease. Their reluctance
to more strongly endorse dog ownership is because most studies are that【S5】________
is called observational—researchers note an association, therefore can’t【S6】________
prove causation. This means that other factors might explain why dog
owners are healthier than, say, goldfish owners—for example, perhaps
only people who are fit at the first place buy pets that need daily walkies.【S7】________
    Tove Fall, the lead author of this latest study, says they tried their
best to allow any differences in education, existing ill-health and lifestyles【S8】________
between those with and without dogs. The study found the bigger positive【S9】________
impact of having a dog was on the people living alone. " It seems that a【S10】________
dog can be a substitute for living with other people in terms of reducing
the risk of dying," says Fall. "Dogs encourage you to walk, they
provide social support and they make life more meaningful. "
【S6】
选项
答案therefore—but
解析 连词误用。该句意为“研究者们不愿意大力支持养狗行为，是因为大多数的研究是观察性研究——研究人员发现养狗与狗主人心脏病发病率低有联系，但无法证明两者之间存在必然的因果关系。”根据句意可知，前后分句为转折关系，故将therefore改为but。
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