问题 选择题

洗发产品中含有的柠檬酸(C6H8O7)能使头发柔顺有弹性且气味清香。下列关于柠檬酸的说法中正确的是

A.柠檬酸属于氧化物

B.柠檬酸是由6个碳原子、8个氢原子和7个氧原子组成的

C.柠檬酸中氧元素的质量分数最大

D.柠檬酸中碳、氢、氧三种元素的质量比为6:8:7

答案

C

 

题目分析:A选项柠檬酸属于氧化物是错误的叙述,氧化物中有两种元素且一种是氧元素,而柠檬酸中含有三种元素;B选项是错误的叙述,应为1个柠檬酸分子是由6个碳原子、8个氢原子和7个氧原子组成的;C选项是正确的叙述,由相对原子质量之和的大小可知;D选项是错误的叙述,应为柠檬酸中碳、氢、氧三种元素的原子个数比为6:8:7 ,故答案选择C

选择题
阅读理解

What is a good education? The question is far from being answered. Once more, colleges and universities are changing their programs: they drop "fun courses" and restart some of the traditional subjects neglected (忽视) since the 1960s. Many great schools are again requiring the students to take a number of classes in English, history, literature, the social sciences, philosophy, the natural sciences, and art if they want to get a degree. Meanwhile, the experts are trying to describe the good education of our time. Obviously the purely vocational training once favored is not enough. But neither is the gentleman's education of the nineteenth century. Educational programs must meet the demands of a modern world where men and women have to work and to deal with big problems.

What, then, is a good education of this century? Some educators suggest that it should include foreign languages and the study of foreign cultures; a mastery of English, including the ability to write and speak well, because communications have become all-important in the modern world, and also because "a person who doesn't speak and write clearly doesn't reason clearly either"; some knowledge of the social sciences (sociology, psychology) that deal with human relations and human problems; some basic knowledge of modern science, which would enable future voters to be better informed about current problems like nuclear. Finally, many educators insist that all college graduates should be familiar with computers and modern information system since the educated professionals of tomorrow will have to understand their machines. Is that all? "No, of course not." answer the educators. "We have not mentioned the two great building blocks of education: history and literature!"

小题1:The best title for this passage might be _______.

A.Education

B.A Mastery of English

C.A Good Education

D.Something About Study小题2:The underlined word "drop" in the first paragraph means _______.

A.desert

B.dislike

C.decline

D.neglect小题3:The author thinks that the question about what a good education is _______.

A.has been answered fairly well

B.hasn't been put forward yet

C.has been dealt with successfully

D.has not been answered satisfactorily小题4:Some educational experts believe a mastery of English should include the ability _______.

A.to read fast

B.to write and speak well

C.to write clearly and accurately

D.to listen and speak skillfully