问题 选择题

下列说法正确的是(  )

A.生物体的结构功能单位是细胞,病毒不具有细胞结构,所以不是生物体

B.凡是看不见的生物体都是单细胞生物

C.单细胞生物和病毒都是对人类有害的

D.单细胞能独立生活,病毒营寄生生活

答案

A、除病毒外,生物体都是由细胞构成的,细胞是生物体结构和功能的基本单位;病毒虽然不具有细胞结构,但它具有一些生物的基本特征,例如遗传、繁殖等,故不符合题意.

B、只有一个细胞的生物体是单细胞生物,病毒比细菌还小的多,只有在电子显微镜下才能看到,但病毒不是单细胞生物,故不符合题意.

C、单细胞生物与人类的关系可以分为有利和有害两个方面,有利:鱼类饵料、净化污水等,有害:危害健康,造成赤潮等;病毒与人类的关系也是如此,既有有害的一面,如使人患病,也有有利的一面,如进行生物防治,故不符合题意.

D、单细胞生物虽然只由一个细胞构成,但也能独立完成营养、呼吸、排泄、运动、生殖和调节等生命活动,病毒虽然不具有细胞结构,但能在寄主细胞内进行一系列生命活动,营寄生生活.故符合题意.

故选:D

填空题
阅读理解

                            Preface

Science is a dominant(占优势的) 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 world, 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(普遍的;深入的)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 form 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.

小题1:According to the passage, ‘scientific subculture’ means

A  cultural groups that are formed by scientists. B  people whose knowledge of science is very limited.

C  the scientific community.    D  people who make good contribution to science.

小题2:We need to know something about the structure and operation of science because

A. it is not easy to understand the things that excite and frustrate scientists.

B Science affects almost every aspect of our life.

C Scientists live in a specific subculture.  D It is easier to understand general characteristics of science.

小题3:The book mentioned in this passage is written for readers who

A are intelligent college students and lay person who do not know much about science.

B are good at producing various gadgets.

C work in a storehouse of dried facts.    D want to have a superficial understanding of science.

小题4:According to this passage,

A English is a sexist language.  B only in the scientific world is the role of women increasing rapidly.

C women are making significant contributions to eliminating the inadequacy of our language.

D male nouns or pronouns should not be used to refer to scientists.

小题5:This passage most probably is

A. book review. B the preface of a book.  C the postscript of a book.  D the concluding part of a book.