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  3. It’ s the first question parents ask when their child is diagnosed with autism (自闭症). Will his future brothers or sisters have a

It’ s the first question parents ask when their child is diagnosed with autism (自闭症). Will his future brothers or sisters have a

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问题     It’ s the first question parents ask when their child is diagnosed with autism (自闭症). Will his future brothers or sisters have a higher risk of【C1】______ it, too?
    According to the largest study of siblings (兄弟姐妹)in families with autism, the answer is yes. Among 664 children who had at least one older sibling with the developmental disorder, the 【C2】______ risk of autism was nearly 19% ,【C3】______ higher than previous sibling recurrence estimates that were anywhere from 3% to 10% . Kids with more than one older autistic sibling had an even higher risk of the disorder: 32%.
    The【C4】______ suggest that genes play a key role in autism risk. But they also hint that other environmental factors【C5】______ by siblings, like influences in the womb (子宫), many be important as well.
    On the【C6】______ of the findings, the researchers recommend mat doctors closely【C7】______ younger siblings of autistic children to pick up any early signs of the disorder,【C8】______ an unusually large head or delayed language development and communication skills. Evidence suggests that early【C9】______ and diagnosis of autism can help children take advantage of therapies that can treat some of its【C10】______.
[A] average [B] basis
[C] common [D] consequently
[E] detection [F] developing
[G] distributed [H] dramatically
[I] including [J] monitor
[K] reason [L] results
[M] shared [N] symbols [O] symptoms
【C5】
选项
答案M
解析 通过分析句子成分得知，此处需要填入过去分词做后置定语，修饰前面的名词factors。全句意思是：但同时也暗示了出生的共同环境因素，如子宫的影响，因此选择M项shared(共同享有)。
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