The textbook is adaptable to a wide variety of course outlines. The entire textbook can be used for an intensive course two or three semesters in length. For a less intensive course, many instructors will want to omit certain chapters or sections to tailor the book to their individual needs. The arrangement of this edition facilitates this kind of flexibility.

　　Conversely, however, many topics that were regarded a few years ago as of peripheral (外围的)importance and were omitted from introductory courses have now come to the fore again in the life sciences, earth and space sciences, and environmental problems. An instructor who wishes to stress these kinds of applications will find this textbook a useful source for discussion of the appropriate principles.

　　In any case, it should be emphasized that instructors should not feel constrained (受约束的)to work straight through the book from cover to cover. Many chapters are, of course, inherently sequential in nature, but within this general limitation instructors should be encouraged to select among the contents those chapters that fit their needs, omitting material that is not relevant to the objectives of a a particular course.

　　6. This textbook lays stress on .A.the exposition of physical principles B.the principles of physics and their application C.the development of physics D.the application of physics in different fields

　　7. Compared with the old one, this new edition .A.has been made more applicable B.is easier to learn C.covers a wider range of subject-matter D.has improved the balance between theory and practice

　　8. One of the features of this textbook is that .A.some contents are dealt with in terms of philosophy B.it has an outline for each chapter C.it introduces the physical principles in great length D.it can be used for different course arrangements

　　9. The underlined words“conversely, however”(ParA.4) indicate that .A.many topics can be emphasized though they were not covered in the old edition B.many topics can be emphasized though they were usually omitted by instructors C.many topics have been added to the new edition as they were not covered in the old one D.many topics have been added to the new edition though they can be omitted by the instructors

　　10. To meet the needs of a particular course, the teacher of this book can omit some of the contents provided that .A.his selection is based on the request of his students B.he does not omit any chapter completely C.his students are particularly intelligent D.he keeps an eye on the internal relations between the chapters