Question 1: What is the percentage of children with long COVID in the study? Question 2: Who were excluded from the study according to the passage? Question 3: What does the passage mainly talk about?
问题1选项
A.2%.
B.10%.
C.12%.
D.20%.
问题2选项
A.Children with no symptoms for a week.
B.Children whose parents stopped using the app.
C.Children with a gap in symptoms longer than one week.
D.Children whose parents did not report their symptoms.
问题3选项
A.The impact of COVID on children.
B.A new study of COVID.
C.D.C.
D.C. The long COVID symptoms in children.D. Underestimate of long COVID on children.
Researchers reported in one study, about 2% children testing positive for COVID-19 have symptoms beyond 56 days. Given important methodological limitations, they believe their results are probably an underestimate due to three key limitations. First, only a limited number of symptoms reported in long COVID were assessed. Given that recording of symptoms regularly is laborious, this is likely to underestimate persisting symptoms for longer periods of time. Second, the study did not adequately account for the well-known relapsing and remitting nature of long COVID. Children with any gap in symptoms longer than one week were excluded, so children whose symptoms temporarily resolved for more than a week and then recurred were not counted. Third, the duration estimates for long COVID are based on parents either reporting their child as asymptomatic with no symptoms for a week, or the last symptomatic report if parents stopped using the app.
Question 1: 题干为：研究中患有携带长时间症状的新冠的儿童百分比是多少？由about 2% children testing positive for COVID-19 have symptoms beyond 56 days（大约2%的新冠阳性儿童有症状持续超过56天）可知，2%的儿童有长时间新冠症状。因此A选项2%正确。
第2题:
Question 2: 题干为：根据文章，哪些人被排除在研究之外？由Children with any gap in symptoms longer than one week were excluded.（任何症状间隔超过一周的儿童被排除在外。）可知，症状间隔超过一周的儿童被排除在研究之外。因此C选项Children with a gap in symptoms longer than one week.（症状间隔超过一周的儿童。）正确。
第3题:
Question 3: 题干为：本文主要讨论的是什么？文章开头说到they believe their results are probably an underestimate due to three key limitations（他们认为，由于三大关键局限性，结果可能低估了长时间新冠症状的情况），接着文章详述了长时间新冠症状低估的三个原因。因此D选项Underestimate of long COVID on children.（低估了儿童长时间新冠的影响。）正确。
