二十一世纪学生英文报初一答案第40期 Some parents will buy any high﹣tech toy if they think it will help their child，but researchers said puzzles help children with math﹣related skills． Psychologist Susan Levine，an expert on mathematics development in young children at the University of Chicago，found children who play with puzzles between ages 2 and 4 later develop better spatial skills．Puzzle play was found to be a significant predictor of cognition（认知）after controlling for differences in parents' income，education and the amount of parent talk，Levine said． The researchers analyzed video recordings of 53 child﹣parent pairs during everyday activities at home and found children who play with puzzles between 26 and 46 months of age have better spatial skills when assessed at 54 months of age． "The children who played with puzzles performed better than those who did not，on tasks that assessed their ability to rotate（旋转）and translate shapes，" Levine said in a statement． The parents were asked to interact with their children as they normally would， and about half of the children in the study played with puzzles at one time．Higher﹣income parents tended to have children play with puzzles more frequently，and both boys and girls who played with puzzles had better spatial skills．However，boys tended to play with more complex puzzles than girls，and the parents of boys provided more spatial language and were more active during puzzle play than the parents of girls． After passing the online course, I attended a two-hour in-person training session where I worked with a real electronic pollbook to practice what I would do on Election Day. The instructor took us through many different scenarios where we practiced assisting different types of voters. I was pleased to see many fellow young people attend the session! In total, I spent 37 hours helping voters vote during this election. With my mask on the entire time, I checked in voters and helped them use the ballot (投票) marking devices where they could cast their vote. I also loved meeting fellow workers who are passionate about being engaged and helping our community. Taking part in this historic election is something I will never forget.Why did the author decide to serve as a poll worker? He considered it his duty to help his community. He was inspired by a Poll Hero volunteer. Young poll workers were in huge demand. It was one of his school’s volunteering programs. 本文来源：https://www.wddqw.com/doc/b47ee2055427a5e9856a561252d380eb6294233c.html