我今年四月考GRE作文,六月笔试.不打算上培训班,应该怎么准备? 还希望推荐一些书,包括作文,语文,数学

(18099.5-303)/303=58.73倍 好快呀要是比率为(18099.5-303)/303*100%=5873%

限制质量是因为质量越大,惯性越大,不易刹车.限制时速是因为速度越大,汽车的动能就越大,减速时动能要转化成大量的内能,与地面摩擦生热.

比喻句：那里四围是山,环抱着一潭春水.那又浓又翠的景色,简直是一幅青绿山水画.
夸张句比喻句：原来是满野的荔枝树,一棵连一棵,每棵的叶子都密得不透缝,黑夜看去可不就像小山似的!

解题思路：中东地区通用的主要语言是阿拉伯语，所以该商务考察团的随行翻译除了母语以外还应该掌握当地的阿拉伯语．

中东地区通用的主要语言是阿拉伯语，所以该商务考察团的随行翻译除了母语以外还应该掌握当地的阿拉伯语．
故选：A．

点评：
本题考点： 世界主要语言及其分布地区．

考点点评： 本题考查了世界主要语言及其分布地区，结合地图掌握．

This April,I stayed for a few days in conghua hotspring scenic spot Guangdong province.There is a deep pond of water surrounded by mountains,the dense green scenery is nothing more than a traditional landscape painting characterized by the prominence of blue and green colours.I arrived in a cloudy night ,leaning by the window and looking outside,puzzled by the reason why there are so many layers of black hills emerging in front of the building groundlessly and stretching endlessly.In front of the building,I remember,is a garden,rather than hills.but What on earth makes this illusion.I can't help laughing When I see them again the next morning,.What I had seen were lychee trees that grew so close together and with such thick leaves that they looked like mounds in the evening.They had resembled small hills in the dark.
个人翻译,希望参考.

I am so sad that I didn't go to Shanghai with my friends which I had wished/planned to because I could't ask for leave from work.I hope to have the chance/opportunity to meet you next time as I will have a book/album signing in April this year in South Korea.

解题思路：根据在化合物中正负化合价代数和为零，进行解答本题．

根据在化合物中正负化合价代数和为零，可得硅酸钙中Si元素的化合价为：（+2）+x+（-2）×3=0，则x=+4．
故选：B．

点评：
本题考点： 有关元素化合价的计算．

考点点评： 本题考查学生根据在化合物中正负化合价代数和为零计算指定元素化合价的解题能力．

这道题的原型是2010地理高考题.
由5月初,天气晴朗,气温骤升,出现严重洪灾.而该地区河流的补给水源是冰雪融水,故知前期积雪量大.
进一步解释是：由经纬度知大致为北美五大湖一带,河流补给以冰雪融水为主.只有在前一段时间形成较多的降水（降雪属于降水）,才有可能在五月气温骤升时溶解更多的水形成洪涝,而积雪的条件是气温低、降水多.