《GMAT官方指南》为英文版。The Official Guide for GMAT Review, 12th Edition is the only book on the market written by the creators of the GMAT exam. Inside you’ll find more than 800 actual GMAT questions from previous tests with answers and detailed explanations. There’s also a grammar review, math review, actual essay topics, sample responses, and scoring information insights into the GMAT exam that debunk test-taking myths. Plus, use the diagnostic section to pinpoint your skill level and focus on the areas where you need the most help.

GMAC（GMAT考试的命题机构）中国大陆唯一授权；《GMAT官方指南》是GMAT考试必备参考书；800道全真试题，涵盖GMAT考试所有题型，并配有全面的答案解析；测试练习部分（diagnostic section）帮助考生评估从何着手复习重点；题目按难易程度排列，节省考生时间；针对GMAT数学部分，进行综合性数学复习；全新的语法复习涵盖GAMT语文部分所有概念；真实作文题目、回答范例及评分信息。

1.0　What Is the GMAT?
1.1　Why Take the GMAT Test?
1.2　GMAT Test Format
1.3　What Is the Content of the Test Like?
1.4　Quantitative Section
1.5　Verbal Section
1.6　What Computer Skills Will l Need?
1.7　What Are the Test Centers Like?
1.8　How Are Scores Calculated?
1.9　Analytical Writing Assessment Scores
1.10 Test Development Process

2.0　How to Prepare
2.1　How Can I Best Prepare to Take the Test?
2.2　What About Practice Tests?
2.3　How Should I Use the Diagnostic Test?
2.4　Where Can I Get Additional Practice?
2.5　General Test-Taking Suggestions

3.0　Diagnostic Test
3.1　Quantitative Sample Questions
3.2　Verbal Sample Questions
3.3　Quantitative and Verbal Answer Keys
3.4　Interpretive Guide
3.5　Quantitative Answer Explanations
3.6　Verbal Answer Explanations

4.0　Math Review
4.1　Arithmetic
4.2　Algebra
4.3　Geometry
4.4　Word Problems

5.0　Problem Solving
5.1　Test-Taking Strategies
5.2　The Directions
5.3　Sample Questions
5.4　Answer Key
5.5　Answer Explanations

6.0　Data Sufficiency
6.1　Test-Taking Strategies
6.2　The Directions
6.3　Sample Questions
6.4　Answer Key
6.5　Answer Explanations

7.0　Reading Comprehension
7.1　What Is Measured
7.2　Test-Taking Strategies
7.3　The Directions
7.4　Sample Questions
7.5　Answer Key
7.6　Answer Explanations

8.0　Critical Reasoning
8.1　What Is Measured
8.2　Test-Taking Strategies
8.3　The Directions
8.4　Sample Questions
8.5　Answer Key
8.6　Answer Explanations

9.0　Sentence Correction
9.1　Basic English Grammar Rules
9.2　Study Suggestions
9.3　What Is Measured
9.4　Test-Taking Strategies
9.5　The Directions
9.6　Sample Questions
9.7　Answer Key
9.8　Answer Explanations

10.0 AnalyticaIWriting Assessment
10.1　What Is Measured
10.2　Test-Taking Strategies
10.3 The Directions
10.4　GMAT Scoring Guide: Analysis of an Issue
10.5　Sample: Analysis of an Issue
10.6 Analysis of an Issue Sample Topics
10.7　GMAT Scoring Guide: Analysis of an Argument
10.8　Sample: Analysis of an Argument
10.9 Analysis of an Argument Sample Topics
Appendix A Percentile Ranking Tables
Appendix B Answer Sheets
Diagnostic Answer Sheet
Problem Solving Answer Sheet
Data Sufficiency Answer Sheet
Reading Comprehension Answer Sheet
Critical Reasoning Answer Sheet
Sentence Correction Answer Sheet
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1.
“Life expectancy”is the average age at death of theentire live-born population.In the middle of thenineteenth century，life expectancy in North Americawas 40 years，whereas now it is nearly 80 years.Thus，in those days，people must have beenconsidered old at an age that we now consider theprime of life.
Which of the following，if true，undermines theargument above？
（A） In the middle of the nineteenth century，thepopulation of North America was significantlysmaller than it is today.
（B） Most of the gains in life expectancy in the last150 years have come from reductions in thenumber of infants who die in their first yearOf life.
（C） Many of the people who live to an advanced agetoday do so only because of medical technolog3that was unknown in the nineteenth century.
（D）The proportion of people who die in theirseventies is significantly smaller today than is th,proportion of people who die in their eighties.
（E） More people in the middle of the nineteenthcentury engaged regularly in vigorous physicalactivity than do so today.
2.
Scientists propose placing seismic stations on thefloor of the Pacific Ocean to warn threatened coastalcommunities on the northwestern coast of the UnitedStates of approaching tidal waves caused byearthquakes.Since forewarned communities couldtake steps to evacuate，many of the injuries anddeaths that would otherwise occur could be avoidedif the government would implement this proposal.
The answer to which of the following questionswould be most important in determining whetherimplementing the proposal would be likely to achievethe desired result？
（A） When was the Iast time that the coastalcommunities were threatened by an approachingtidal wave？
（B）How far below sea Ievel would the stations belocated？
（C） Would there be enough time after receivingwarning of an approaching tidal wave forcommunities to evacuate saf
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