B.实例说明
例1（文章请看推理判断例2，2003年全国高考）
①What would be the best title for the text?
A.Computers and Printers B.E-mail and the Business World
C.Internet Revolution and Environment D.Modern Technology and New Markets
[分析]本题考查对于全文主旨大意的把握并要求考生据此选择最佳标题。
全文的关键词应该是Internet和Environment，因此答案为C.
其余选项中的computers，printers，e-mail，business world，technology，market都在文中提到了，但其作用只是为了阐明主题所需，答题时不可以点代面。
例2：As prices and building costs keep rising,the "do-it-yourself"（DIY）trend（趋势）in the U.S.continues to grow."We needed furniture（家具）for our living room,"says John Ross,"and we just didn't have enough money to buy it.So we decided to try making a few tables and chairs."John got married six months ago,and like many young people these days,they are struggling to make a home at a time when the cost of living is very high.The Rosses took a 2-week course for $ 280 at a night school.Now they build all their furniture and make repairs around the house.Jim Hatfield has three boys and his wife died.Hs has a full-time job at home as well as in a shoe making factory.Last month,he received a car repair bill for $ 420."I was deeply upset about it.Now I've finished a car repair course,I should be able to fix the car by myself."John and Jim are not unusual people.Most families in the country are doing everything they can to save money so the can fight the high cost of living.If you want to become a "do-it-yourselfer",you can go to DIY calsses.And for those who don't have time to take a course,there are books that tell you how you can do things yourself.（1998NMET）
②。What would be the best title for the text?
A.the Joy of DIY B.You Can Do It Too!
C.Welcome to Our DIY Course! D.Ross and Hatfield:Believers in DIY.
[分析]根据首句As prices and building costs keep rising,the "do-it-yourself"（DIY）trend（趋势）in the U.S.continues to grow.和尾句And for those who don't have time to take a course,there are books that tell you how you can do things yourself.可以知道答案为B