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 1 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 2 risk of autism was nearly 19% , 3 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 4 suggest that genes play a key role in autism risk. But they also hint that other environmental factors 5 by siblings, like influences in the womb (子宫), many be important as well. On the 6 of the findings, the researchers recommend mat doctors closely 7 younger siblings of autistic children to pick up any early signs of the disorder, 8 an unusually large head or delayed language development and communication skills. Evidence suggests that early 9 and diagnosis of autism can help children take advantage of therapies that can treat some of its 10.[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