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二、尋找主題句的方法
正確的解答這類題目的關鍵是準確地找出文章的主題句。一般來說，一篇文章常常會圍繞著一個中心思想或一個主要話題展開，而這個話題又常常通過一個能比較全面地覆蓋或概括文章意思的句子，即所謂的“主題句”來體現。那么，主題句通常在哪里呢？(1)主題句在文首；(2)主題句在文中；(3)主題句在文末；(4)主題句以首尾呼應的形式出現在文首和文末。
1. 主題句在文首
這類文章寫法上的特點是：文章的第一句起著點題的作用，概括了文章的主要內容或信息，下文接著對主題句所涉及的話題進行具體的闡述。如：(全國高考題)
A JINTAN, JIANGSU: The 20 students — 18 boys and 2 girls —had a thousand reasons to be proud of themselves. They had just climbed their way to the top rung(階梯)out of 4 million students taking part in the Fifth National Hua Luogeng Gold Cup Mathematics Contest (競賽)on Tuesday evening.
The 20 gold medal winners are all primary and middle school students under the age of 14.
"Many of the problems are of college level and these pupils can figure them out. It is just unbelievable!" said a teacher from Guangdong province.
Named after China's most famous mathematician, Hua Luogeng, the contest started in 1986, one year after his death. In less than 10 years, it has been recognized by the State Education Commission(國家教委) as the country's biggest and best contest of its kind.
This news story is mainly about ______.
A. when the contest started
B. how the contest got its name
C. the 20 pupils who have won gold medals in the contest
D. the 5th National Hua Luogeng Gold Cup Mathematics Contest
【分析】這是一篇報道，文章的第一段只有兩句話：“20個學生(2女18男)有充分的理由為自己感到自豪，因為他們奪得了第五屆華羅庚杯數學競賽的金獎，是4百萬參賽學生中的佼佼者”，下文接著對競賽的有關情況進行報道，因此，第一段實際上就是這篇報道的主題句。A、B、C分別只包含了報道的部分信息，顯然不合題意；D選項與主題句的意思完全一致，因此是正確答案。
