题目内容：

Consensus about screens(硅谷精英禁子女玩手机)

The people 1.are  2.(close) to a thing are often the most wary (警惕的)of it. 3.(Technology) know how phones really work, and many have decided they don't want their own children anywhere near them. 4.wariness that has been slowly brewing is turning into a regionwide consensus in Silicon Valley: The benefits of screens 5.a learning tool 6.(overblow), and the risks for addiction and stunting development seem high. Tim Cook, the CEO of Apple, said earlier this year that he would not let his nephew join social networks. Bill Gates 7.(ban) cellphones until his children were teenagers. "On the scale between candy and crack cocaine,  8. is closer to crack cocaine," Chris Anderson, the former editor of Wired, said of screens. "We thought we could control it. 9.it's beyond our power 10.(control). This is going straight to the pleasure centers of the developing brain."