2. 外语
  3. This book is intended to provide the students of physical science with help in mastering elementary physics, chemistry, earth sc

This book is intended to provide the students of physical science with help in mastering elementary physics, chemistry, earth sc

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问题    This book is intended to provide the students of physical science with help in mastering elementary physics, chemistry, earth science and astronomy (天文学). A wide spectrum (范围) of topics is covered, so that the reader may select those which correspond to his particular interest or needs.
   Each chapter begins with an outline of its subject. The discussed problems that follow are of two kinds: those that are connected with past development of physics and chemistry, and those that concern important facts and ideas in physical science.
   The supplementary problems at the end give the reader both a chance for practice and a means to judge his progress.
   The book will help those who major in  (46)  to master the elementary knowledge of physics, chemistry,  (47)  and astronomy.
   At the beginning of each chapter, there is  (48)  of its subject. In each chapter,  (49)  of problems are discussed.
     (50)  at the end make the reader practice and judge his progress.

选项
答案two kinds
解析 本题要求填写在每一章节要求讨论几种问题，根据原文第2段第2句话可以得知答案是two kinds。
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