The problem of children violence has been discussed thoroughly in the wake of last week’s tragedy in Arkansas. Some discussions center in easy 62. ______ access to guns, exposure m TV violence, and parents’ divorce. However, many children have access to guns and don’t kill their classmates. Most children get 63. ______ immersed in the phony (假冒的) violence of television don’t injure others. And more than half of the country’s children have to deal with living with just one parent at some point in their lives and the vast minority of them can adjust 64. ______ well. So what is the root cause of violence in children What turns a bright-eyed infant in the need of love and safety into a juvenile killer Researchers 65. ______ have found that very young children that witness anger and violence in their homes are far more prone to violence later in life to other children. They’ve 66. ______ also shown that illegal drugs, alcohol and toxins can have a disturbed effect on 67. ______ the developing brains of fetuses (胎儿). For the first time, these various studies had been compiled in a new book that traces the roots of violence in children to 68. ______ the womb and the fast two years after birth, "Ghosts from the Nursery". According to the book, when violent images can play a contributing role 69. ______ in violent acts, the bottom line is which violence begins in the brain and the 70. ______ brain begins in the womb. Toxic experiences — family violence, abuse and chronic neglect, along with toxic affairs such as nicotine, alcohol and illegal 71. ______ drugs — are being physically and emotionally absorbed by our babies in record numbers.