题目

Liu Xu was robbed(抢劫)! The 13-year-old was riding home when a man jumped out from the road-side. He pulled Liu off his bike and rode away. Liu was scared, but he didn’t run after the robber. He found a telephone and called the police at 110.“Safety is the first in such a situation,” Liu said, remembering what his teacher had told him in his aid class. “It’s not safe to run after an adult who is much stronger than you.”Liu is a student at Shenzhen Bao’an Middle School in Guangdong. His school is one of the first in China to have required first aid education. Grade 1 students m(2012•深圳二模)在实数范围内,方程|x|+|x+1|=1的解集是[-1,0][-1,0].
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