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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 that 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
【C6】
选项
答案B
解析 此处需要填入名词，构成词组on the basis of，意思是：在(发现)的基础上。故选B项basis。
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