为使流过线圈的电流最大，电容器应如何调整？（）A.使容抗等于发生器阻抗； B.使容抗

Preface to the fourth edition

A practical English Grammar is intended for intermediate(中级的) and post-intermediate students. We hope that more advanced learners and teachers will also find it useful.

The book is a comprehensive survey of structures and forms, written in clear modern English and illustrated with numerous examples. Areas of particular difficulty have been given special attention. Differences between conversational usage and strict grammatical forms are shown but the emphasis is on conversational forms.

1. Explanation and examples have been brought up to date.

2. There is now more information on countable and uncountable nouns, attributive and predicative adjectives, adverbs of places, sentence adverbs, cleft sentences, prepositions, conjunctives, modal verbs, perfect tenses, infinitive constructions, the passive, purpose clauses and nouns.

In the fourth edition the main changes are as follows.

3. Some material has been rearranged to make comparisons easier. For example, parts of chapters on can, may, must etc. are now grouped by functions; verbs of liking and preference have a chapter to themselves; suggestions and invitations have joined the chapter on commands, requests and advice.

4. The contents list now summaries every edition heading, and there is a new index containing many more entries references.

In this edition the sign “～” is frequently used to show a change of speaker in examples of dialogue. Note also that although the sign “＝”sometimes connects two words or expressions with the same meaning, it is often used more freely, e.g. to indicate a transformation from active to passive or direct to indirect speech.

We wish to thank all at Oxford University Press who have assisted in the preparation of the fourth edition. We would also like to thank Professor Egawa of Nihon University, Japan, Professor Rene Dirven of Duisburg University, West Germany and other colleagues for their friendly and helpful suggestions.

London, November 1985                                   A.J.T., A.VM

小题1:The grammar book mentioned in this passage is not suitable for __________.

A．a middle school teacher

B．a college student

C．a senior high student

D．a primary school student小题2:According to the passage, we know that this grammar book ___________.

A．compares modern English with old English

B．gives a large number of examples to reduce difficulty

C．attaches more importance to conversational forms

D．pays little attention to strict grammatical forms小题3:Which of the following statements about the changes is TRUE?

A．This book keeps up with the latest usages of the American English language.

B．This edition offers more information about pronouns.

C．One particular chapter discusses verbs like “care, like, love, hate, prefer, wish”.

D．It’s not easy for us to find the information we need in this book.小题4:When you see this line in the book, “Did you get a ticket? ～Yes, I managed to get one”, we can understand that _______.

A．the two parts before and after the sign “～”mean the same.

B．the topic is changed in the part after the sign “～”.

C．the second speaker repeats what the first speaker says.

D．the two parts before and after “～”are said by two different people.

下列有关吊运作业安全注意事项的说法中，不正确的是（）。

A．严禁超负荷使用起吊工具

B．在吊运前，应认真检查起吊工具，确认牢固可靠，方可吊运

C．断股钢丝、霉烂绳索和残损的起吊工具，修理后，可以继续使用

D．吊起的部件，应立即在稳妥可靠的地方放下，并衬垫绑系稳固

可燃物燃烧除需要氧气外，还需要满足的条件是　       ，煤块经粉碎处理后燃烧的更快，这是因为　     　．

患者，女，31岁，患者近5个月来，经后1至2天，小腹隐痛喜按，阴部空坠不月经病69适，月经量少，色淡，质清稀，面色无华，神疲乏力，头晕心悸，舌淡，脉细无力

此病诊断为（）

A.肝肾亏损型痛经

B.寒湿凝滞型痛经

C.气血虚弱型痛经

D.气滞血瘀型痛经

E.湿热瘀阻型痛经

（）是用于工业、农牧业、林业、公务、通勤、体育和娱乐等方面的航空。

A、商业航空

B、民用航空

C、军事航空

D、通用航空