答案：
Solar cars are cars that use sunlight for power while common cars use gas or petral as their fuel. Both of them have advantages and disadvantages. Solar cars are safe and clean but they have low power and they are slow and they cannot run at night. Common cars have strong power and it is convenient for us to use but they pollute the environment.
I suggest that we need to develop future technologies to improve the power for solar cars and to use clean energy for common cars.
题目分析：写好提纲式作文的关键是认真审题和分析所给的提纲，因此考生首先要认真阅读前面的提示，认清写作要求和提纲之间的关系，然后确定文章的主题、文体、人称和时态。根据所给提纲，列出要点，并以此为基础充分发挥自己的想象力，灵活运用英语知识，采用不同的表达方式将各要点完整地表述出来，注意主次分明，详略得当。语言力求准确、简洁。根据情景的发展，按顺序安排好材料。同时应选用合适的连接词或过渡词，使文章具有一定的连贯性。考生必须认真查验是否有漏写情况，有无拼写错误及标点误用等。
【亮点说明】Solar cars are cars that use sunlight for power while common cars use gas or petral as their fuel. 这句话用了定语从句和while的并列句， Solar cars are safe and clean but they have low power and they are slow and they cannot run at night. 这句话用了but的转折句和并列句，Common cars have strong power and t it is convenient for us to use but they pollute the environment.这句话用了be convenient to do， I suggest that we need to develop future technologies to improve the power for solar cars and to use clean energy for common cars.这句话用了虚拟语气和不定式做目的状语。