按电负性值依次增大顺序排列的是
A．P S N
B．Li Na K
C．Li B Be
D．S P Si
答案：A
题目分析：非金属性越强，电负性越大，因此A正确。B不正确，应该是K、Na、Li；C不正确，应该是Li、Be、B；D不正确，应该是Si、P、S，答案选A。
点评：该题是基础性试题的考查，试题注重基础，兼顾能力的培养和训练。该题的关键是明确影响电负性大小的因素，然后结合同样灵活运用即可，难度不大，学生不难得分。
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 World Book Day falls on April 23 every year. It was set up by UNESCO (联合国教科文组织) in 1955 to encourage people, especially teenagers, to discover the pleasure of 1 . Many countries celebrate World Book Day. On that day in the UK, millions of students can buy 2 of special price, much lower than usual in any bookstore. It has been done every year 3 1998. World Book Day is also celebrated in China. Premier Wen Jiabao does lots of reading 4 he's very busy. On World Book Day 2009, he 5 people to do more reading. He suggested that young people should spend more time reading. "Books can't change the world, but people can change the world by changing 6 through reading," he said. Reading can benefit (有益于) people 7 . Reading helps us become more knowledgeable and more intelligent. Reading helps us to follow the 8 developments of science and technology. Reading 9 us with information about other culture and places of the world. When we read, we may find many things 10 are unfamiliar to us. We would have to use our brain 11 about them or do more reading to find out the answers. The more we read, the more we know. The more we know, the 12 we become. Reading is also one of the most important ways to learn a foreign language 13 English. We all know that we 14 learn everything at school, for example, the ways English people are speaking and writing today. "Reading makes a full man." Books, magazines, newspapers and other kinds of reading materials can help to know more about the outside world and perfect us. 15 , it is necessary for us to form the habit of reading every day. | ||||
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