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  3. Dogs really are our best friends, according to a Swedish study that says ca

Dogs really are our best friends, according to a Swedish study that says ca

游客2023-11-24  15
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. " [br] 【S5】
选项
答案 that—what
解析 从句引导词误用。此句主干为主系表结构，其中because引导表语从句，而该从句又是一个主系表结构，其中that所处的位置应为表语从句引导词，并且该引导词在从句中充当主语，而that引导名词性从句时在句中一般不充当任何成分，因此应将that改为what。
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