问题 解答题

求直线2x+(3k-1)y+k-1=0在x、y轴上的截距.

答案

令y=0,则x=,于是直线在x轴上的截距为.

令x=0,则(3k-1)y+k-1=0,于是直线在y轴的截距为:

当k=时,直线在y轴上的截距不存在;

当k≠时,直线在y轴上的截距为.

按照截距的定义求解,即在方程中令y=0,则x的取值即为直线在x轴上的截距;令x=0,则y的取值即为直线在y轴上的截距. 本题容易忽视对y轴截距是否存在的讨论,即忽视了k=的情形而造成错解.事实上,当k=时,分式无意义,此时的直线在y轴上的截距不存在.

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 ④wellknown 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。              ______________

单项选择题