题目：
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| Football may be the most _1_ of the games. People in many _2_ around the world like playing it. In the 19th century (世纪) _3_ in England first played this kind of balls. The players moved the ball _4_ .The first international (国际的) football game was between England and Scotland in 1872. Football is played by _5_ with eleven men on each team. Each team has one way to _6_. It must score more goals (进球) _7_ the other team. Each _8_ in games is one point (分).Football is a round ball. Players may kick (踢) it and _9_ it by any part of the body except the _10_. Only one player on the team can use his hands. This player is the goal keeper. A football game usually _11_ for ninety minutes. The teams play for forty-five minutes, and then take a short rest. After this halftime rest, they play again for _12_ forty-five minutes. Now football is one of _13_ played in the Olympics (奥林匹克运动会). Another important international football match is called the World Cup. The World Cup is had _14_ every four years. The _15_ of the World Cup match is the world champion (冠军) football team. | ||||
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猜想b：此反应还会放热；（1）O2 ；（2）过氧化钠与水反应放热使锥形瓶内压强增大；（3）Na和H；【补充实验】能； 水和二氧化碳题目分析：提出猜想：根据物质燃烧的条件：脱脂棉是可燃物，小新认为过氧化钠（Na2...
