火焰矫正时，火焰性质一般为（）。A.碳化焰 B.氧化焰 C.中性焰 D.弱氧化焰

「窓を　閉めましょうか。」　　「いいえ、その　ままに　して　おいて　ください。換気の　ために————あるんです。」

A．開く

B．開いて

C．　開ける

D．開けて

《储蓄管理条例》规定：未到期的定期储蓄存款，全部提前支取的，按（）储蓄存款利率计付利息。

A、支取日挂牌公告的定期

B、开户日挂牌公告的活期

C、支取日挂牌公告的活期

D、开户日挂牌公告的定期

下列关于企业所得税法的表述，正确的有（）。

A.企业所得税按纳税年度计算，纳税年度自公历1月1日起至12月31日止

B.母公司为其子公司提供各种服务而发生的费用，应按照公平交易原则确定服务的价格作为企业正常的劳务费用进行税务处理

C.实行应税所得率方式核定征收企业所得税的纳税人，经营多业的，无论其经营项目是否单独核算，均由税务机关根据其主营项目确定适用的应税所得率

D.子公司申报税前扣除向母公司支付的服务费用不能提供相关材料的，支付的服务费用由税务机构核定税前扣除额

E.企业所得税核定征收办法规定，纳税人的生产经营范围、主营业务发生重大，或应纳税额增减变化达到30%的，应及时向税务机关申报调整已确定的应纳税额或应税所得率

井口（）米范围内严禁烟火。

A、30

B、20

C、15

Science is a dominant theme in our culture. Since it touches almost every facet of our life, educated people need at least some acquaintance with its structure and operation. They should also have an understanding of the subculture in which scientists live and the kinds of people they are. An understanding of general characteristics of science as well as specific scientific concepts is easier to attain if one knows something about the things that excite and frustrate the scientist.
This book is written for the intelligent student or lay person whose acquaintance with science is superficial, for the person who has been presented with science as a musty storehouse of dried facts, for the person who sees the chief objective of science as the production of gadgets, and for the person who views the scientists as some sort of magician. The book can be used to supplement a course in any science, to accompany any course that attempts to give an understanding of the modern work, or--independently of any course --simply to provide a better understanding of science. We hope this book will lead readers to a broader perspective on scientific attitudes and a more realistic view of what science is, who scientists are, and what they do. It will give them an awareness and understanding of the relationship between science and our culture and an appreciation of the roles science may play in our culture. In addition, readers may learn to appreciate the relationship between scientific views and some of the values and philosophies that are pervasive in our culture.
We have tried to present in this book an accurate and up-to-date picture of the scientific community and the people who populate it. That population has in recent years come to comprise more and more women. This increasing role of women in the scientific subculture is not a unique incident but, rather, part of the trend evident in all segments of society as more women enter traditionally male-dominated fields and make significant contributions. In discussing these changes and contribution, however, we are faced with a language that is implicitly sexist, one that uses male nouns or pronouns in referring to unspecified individuals. To offset this built-in bias, we have adopted the policy of using plural nouns and pronouns whenever possible and, when absolutely necessary, alternating he and she. This policy is far from being ideal, but it is at least an acknowledgment of the inadequacy of our language in treating half of the human race equally.
We have also tried to make the book entertaining as well as informative. Our approach is usually informal. We feel, as do many other scientists, that we shouldn’t take ourselves too seriously. As the reader may observe, we see science as a delightful pastime rather than as a grim and dreary way to earn a living.

This passage most probably is ______.

A. a book review



B. the preface of a book
C. the postscript of a book

D. the concluding part of a book