Question

18．With limited space for parks and gardens，architects and city planners often find it challenging to include greenery in neighborhoods in cities．One creative solution is to grow plants on unused areas like walls and rooftops．It's a popular idea，and now rooftop gardens and green walls have been sprouting up（大量冒出）in cities around the world．
There are many benefits of having green spaces to the urban landscape．Adding gardens to rooftops or walls can create a pleasant environment--what was once a gray cement（水泥）wall can become a colorful，blooming garden．The CaxiaForum art gallery in Madrid，Spain，is a famous example--one of its walls is covered with 15，000 plants from over 250 different species．In other cities，green walls are being used more functionally，to cover up construction sites and empty buildings and to decorate the lobbies of office buildings．
Using plants to cover walls and rooftops can also keep cities cooler in the summer．Buildings and roads absorb the sun's heat and hold it，causing a building or neighborhood to stay warmer longer．Plants，on the other hand，provide an enormous amount of shade．There is evidence that growing a roof or wall garden can lower a building's energy costs．
In New York City，public schools plant rooftop gardens that can reduce heating and cooling costs．In addition to saving the school money，teachers and parents love the gardens because of their educational value--it's a fun and healthy way for their kids to investigate the world around them．"For the children，it's exciting when you grow something edible（可食用的），"said Lauren Fontana，principal of a New York public school．
Rooftop gardens and green walls may require a bit more effort to grow and maintain．However，hard work always brings rewards，and with green spaces，the rewards are plentiful．
Due to the limited space in cities，rooftop gardens and green walls have emerged．（要点1）One benefit of adding green to rooftops and walls is to offer an agreeable surroundings．（要点2）Besides，shade can be created to make cities stay cooler longer，thus reducing the costs in energy．（要点3）What's more，green gardens in school bear educational value of children's exploring the world．（要点4）Though hard to maintain，green spaces in cities ensure abundant rewards．（要点5）
（71 words）．

Answer 1

分析 写好这类作文要注意几个步骤：1． 认真审题，找准提示语中的关键词或句，确定中心思想．2． 依据关键句，草拟提纲，梳理文章的脉络3． 准确定位人称、时态．注意使用高级词汇和高级句型使文章显得更有档次．4．最后还要认真查验是否有漏写情况，有无拼写错误及标点误用等
高分句型一：
Due to the limited space in cities，rooftop gardens and green walls have emerged
由于在城市有限的空间，屋顶的花园和绿色的墙壁已经出现．
高分句型二：
What's more，green gardens in school bear educational value of children's exploring the world．
更重要的是，在儿童探索世界的学校承担教育价值的绿色花园．

解答 Due to the limited space in cities，rooftop gardens and green walls have emerged（高分句型一）．（要点1）One benefit of adding green to rooftops and walls is to offer an agreeable surroundings．（要点2）Besides，shade can be created to make cities stay cooler longer，thus reducing the costs in energy．（要点3）What's more，green gardens in school bear educational value of children's exploring the world（高分句型二）．（要点4）Though hard to maintain，green spaces in cities ensure abundant rewards．（要点5）
   （71 words）

点评 开放性作文给出一定的写作主题，并此为基础进行思维和联想，自由发挥．不仅考查学生在内容、结构安排、语言运用和组织方面的能力，而且对学生的想像力、发散思维、归纳判断能力也有很高的要求．