Autism (儿童自闭症) is a serious mental illness, especially of children, in which one becomes unable to communicate or form relationships with others. There has been alarming rise in autism rates in the U. S. and 62. ______ some other developed nations recently, which have come one of the most 63. ______ anguishing mystery of modern medicine, and the source of much desperate speculation 64. ______ by parents. In 1970, the incidence of autism was thought to be just 1 in 2,500; today about 1 in 170 kids born in the U, S. is down by autism. 65. ______ According to a recent study performed by Cornell University, autism can be caused by watching too much television at a tender year. "Approximate 17% of 66. ______ the growth in autism in California and Pennsylvania during the 1970s and 1980s was due to the growth of cable television". This is further supported by the fact which at present around 40% of autism diagnoses in the two states studied is the 67. ______ result of television watching due to precipitation. There aren’t yet unreliable large-scale data on the viewing habits of kids 68. ______ aging 1 to 3—the period when symptoms of autism are typically identified, but 69. ______ the researchers are not at all discouraged. Once this fact becomes more obvious, it’s time for parents to really take it serious and take actions to protect their 70. ______ children off this serious illness. 71. ______