低碳经济使我们的生活更美好．（1）世博会上展出的“叶子”概_爱下问搜题

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问题填空题

低碳经济使我们的生活更美好．

（1）世博会上展出的“叶子”概念车，是一部光电转化器，把______能转化为电能；100辆燃料电池观光车“喝”的是氢气，产生的是水，真正实现了“零排放”，试写出该反应的化学方程式______

（2）世博会上使用的饭盒、购卡、证件等都是用“玉米降解塑料”制成，制作第一步是将玉米发酵制得乳酸（C₃H₆O₃）．乳酸由______种元素组成，其中碳元素的质量分数为______．

答案

（1）世博会上展出的“叶子”概念车，是一部光电转化器，把太阳能转化为电能；氢气燃烧水，该反应的化学方程式2H₂+O₂

点燃

.

2H₂O；

（2）由乳酸的化学式为C₃H₆O₃可知，乳酸由碳、氢、氧三种元素组成，其中碳元素的质量分数=

12×3

12×3+1×6+16×3

×100%=40%．

故答案为：（1）太阳；2H₂+O₂

点燃

.

2H₂O；（2）三；40%．

完形填空

阅读下面的短文，按要求完成所给任务。（共5小题，计10分）

Reading is a very good hobby for all the students. You can know much about the world ①_____ the help of all kinds of books. I’m sure everyone has a favorite subject. For example, some are interested in animals, some in history, and some are interested in literature. Mine is science. I like ②___it___ because it’s fun and educational.

My favorite novel is Around the World in Eighty Days.③It was written by Jules Verne ,a French writer. Jules Verne was regarded as father of Modern Science Fiction because he devoted(奉献) himself to literature and wrote several ④well–known scientific romances.

The exciting story of Around the World in Eighty Days tells us about an English gentleman whose name is Mr. Phileas Fogg , He travels around the world in eighty days. From the story, we can see the writer’s love for the sea, traveling and adventure(冒险).In fact, they played an important role in his life.⑤多亏了the writer’s imagination, language skills and scientific and geographical(地理的) knowledge, we can feel as if we were there when we read the story.

小题1:根据上下文写出①处所缺的单词。 ______________

小题2:写出②处划线单词所指代的内容。 ______________

小题3:将③处改为主动语态。

Jules Verne, the French writer _________ the novel Around the World in Eighty Days.

小题4:写出④处划线单词的同义词。 ______________

小题5:将⑤处划线汉语翻译成英语。 ______________

填空题

在恒电流电解分析时, 为了防止干扰, 需加入去极剂, 以（）在恒电流库仑分析中, 需加入辅助电解质, 除具有相同的目的外, 它产生滴定剂。