题目

(能力挑战题)已知五种元素的原子序数的大小顺序为C>A>B>D>E;A、C同周期,B、C同主族;A与B形成的离子化合物A2B中所有离子的电子数相同,其电子总数为30,D和E可形成4核10个电子分子。试回答下列问题:(1)写出五种元素的名称。A? ,B? ,C? ,D? ,E? 。(2)用电子式表示离子化合物A2B的形成过程:_________ ____________。(3)写出D元素形成的单质的结构式: ____________________。(4)写出下列物质的电子式:E与B形成的化合物: ;A、B、E形成的化合物: ? ;D、E形成的化合物: ___________ 　　The brain is the boss of the body．Your eyes，ears，nose，and skin tell your brain what is going on around you．Other parts of your body tell your brain what is going on inside of you．Your brain takes in the signals．It tells your body what to do with them．When you touch fire，your skin tells your brain that your finger is too hot．Your brain tells you to move your finger．All these happen very fast．Your brain also controls your breathing，blinking（眨眼），and heartbeat．It controls your feelings and thoughts too． 　　Human shave the most developed brain of all animals．Yet it is not the largest brain．The human brain weighs three pounds．The brain of an elephant weighs 11 pounds．So the largest brain is not always the best brain．In people，a larger brain does not mean a clever person． 1．What is the main idea of this story? 　　A．The human brain works very fast． 　　B．The largest brain is not always the best brain． 　　C．The brain controls the body． 　　D．The best brain is the largest brain． 2．What happens after the brain takes in the signals from the body? 　　A．The brain grows faster and larger． 　　B．The brain tells the body what to do． 　　C．The body becomes more developed． 　　D．We don't know． 3．What does “the boss of the body” mean? 　　A．The signals． 　　B．The most developed body part． 　　C．The main part of the body. 　　D．The centre I centre of the body． 4．Which brain is the most developed? 　　A．The largest brain．　　　　　　　　　  B．The human brain． 　　C．The smaller brain．　　　　　　　　　　D．Not too big brain． 5．What are the things that the human brain does? 　　A．Takes in signals．　　　　　　　　　　   B．Controls breathing． C．Controls feelings and thoughts．　　　    D．A，B and C．