【正确答案】 1、to place much emphasis on the practice of semi-technical terms    

【答案解析】本题为细节归纳题，第一段最后一句“Readers should understand，however，that the purpose of the book is to read the language，not o teach engineering”明确说明词汇是本书重点，第二段第二、三句“The most obvious and the most widely recognized of these problems is the vocabulary． Much more difficult are the semi—scientific or semi—technical words，…”又进一步说明重点是半科技词汇，因此归纳可得该。