为了改善住房条件，小亮的父母考察了某小区的A、B两套楼房，A套_爱下问搜题

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问题选择题

为了改善住房条件，小亮的父母考察了某小区的A、B两套楼房，A套楼房在第3层楼，B套楼房在第5层楼，B套楼房的面积比A套楼房的面积大24平方米，两套楼房的房价相同，第3层楼和第5层楼的房价分别是平均价的1.1倍和0.9倍．为了计算两套楼房的面积，小亮设A套楼房的面积为x平方米，B套楼房的面积为y平方米，根据以上信息列出了下列方程组．其中正确的是（　　）

A．

0.9x=1.1y

y-x=24

B．

1.1x=0.9y

x-y=24

C．

0.9x=1.1y

x-y=24

D．

1.1x=0.9y

y-x=24

答案

设A套楼房的面积为x平方米，B套楼房的面积为y平方米，

可列方程组为

1.1x=0.9y

y-x=24

．

故选D．

填空题

（4分）日常生活、工农业生产中的许多问题及人体健康都与化学知识密切相关。

（1）用天然钻石可以制石油勘探中钻井机的钻头。之所以选择钻石作钻头是因为钻石具有下列性质：① ；② ；

（2）为减少“温室效应”带来的负面影响，法国化学家Paul -Sabatier提出CO2甲烷反应。该反应使CO2和H2在催化剂作用下生成CH4和H2O，试写出该反应的化学方程式 ______________________________

完形填空

A boy was walking home from school when he saw a large, tempting （诱人的）apple on one of the branches of an apple tree hanging out over a tall fence. The boy wasn’t much of a fruit-eater, 41 a bar of chocolate if given the choice,     42   , as they say, the forbidden fruit can be tempting. Seeing the apple, the boy wanted it. The more he looked at it, the    43   he felt and the more he wanted that apple.
44  as high as he could , but even at his tallest 45 he was unable to touch it. He began to 46 up and down , as high as he could, at the 47 of each jump stretching his arms to get the apple . Still it remained out of 48 .
Not giving up , he thought , if only he had something to 49 on . His school bag wouldn’t give enough height and he didn’t want to 50  the things inside , like his lunch box , pencil case , and Game boy . Looking  51 , he hoped he might find an old box , a rock , or ,   52 luck , even a ladder , but it was a tidy neighborhood and there was nothing he could use .
He had tried everything he could think to do .   53  seeing any other choices , he gave up and started to walk   54 . At first he felt angry and disappointed thinking about how hungry he had become from his 55 , and how he really wanted that apple . The more he 56 like this , the more unhappy he became.
57   ,the boy of our story was a pretty smart guy, even if he couldn’t always get what get he wanted .He started to say to himself .,This isn’t   58    , I   don’t have the apple and I’m feeling miserable as well. There’s 59  more I can do to get the apple_that is unchangeable-but we are supposed to be able to 60 our feelings. If that’s the case, what can I do to feel better?