50周岁打算补缴居民养老保险可以吗？还能享受政府补贴吗？

下列属于人气型指标的是（）。

A.BIAS

B.PSY

C.ADR

D.OBV

炼铁厂有2000t含Fe₂O₃70%的铁矿石，试通过计算回答下列问题：

（1）Fe₂O₃中Fe与O元素的质量比______；

（2）这些矿石最多可以炼出含铁98%的生铁______t．

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

某公司普通股去年每股股利为1.32元，希望能维持8%的年增长率。（1）若该公司每股股价为23.5元，求股票的预期报酬率。（2）如果投资者对该股票要求的报酬率为10.5%，该股票的价值是多少？

盾构法隧道衬砌自防水、衬砌外防水涂层、衬砌接缝防水和内衬结构防水应符合设计要求。( )