托福閱讀遇到說(shuō)明文要怎么理解?

　　托福閱讀中的說(shuō)明文題目一般難度較高，下面小編通過(guò)實(shí)例給大家講講說(shuō)明文的解題思路。

　　托福閱讀說(shuō)明文結(jié)構(gòu)講解

　　一般而言，托福閱讀中的說(shuō)明文會(huì)說(shuō)明某個(gè)現(xiàn)象，文章的第1段是：介紹背景及引出下文;之后的主體段，結(jié)構(gòu)也很清晰：主旨句Topic sentence + 解釋句Explain + 舉例子Examples + 總結(jié)句Summary。其實(shí)跟我們高考語(yǔ)文有異曲同工之妙。下面來(lái)看實(shí)例解析：

　　官方真題Official-19 The Roman Army's Impact on Britain

　　In the wake of the Roman Empire's conquest of Britain in the first century A.D., a large number of troops stayed in the new province, and these troops had a considerable impact on Britain with their camps, fortifications, and participation in the local economy. Assessing the impact of the army on the civilian population starts from the realization that the soldiers were always unevenly distributed across the country. Areas rapidly incorporated into the empire were not long affected by the military. Where the army remained stationed, its presence was much more influential. The imposition of a military base involved the requisition of native lands for both the fort and the territory needed to feed and exercise the soldiers' animals. The imposition of military rule also robbed local leaders of opportunities to participate in local government, so social development was stunted and the seeds of disaffection sown. This then meant that the military had to remain to suppress rebellion and organize government.

　　留下 these troops had a considerable impact on Britain;也就是第1句說(shuō)的是羅馬軍隊(duì)對(duì)英國(guó)有影響。這句話相當(dāng)于對(duì)題目的闡述，交代了文章的整個(gè)大背景。之后2～4句其實(shí)交代前提，開(kāi)始具體的說(shuō)開(kāi)，要估算軍隊(duì)對(duì)平民的影響首先要了解一個(gè)事實(shí)：士兵不是平均分布的。那既然不是平均分布，肯定是有多有少的。所以，第三句接著說(shuō)了有些地方士兵少：很快融入帝國(guó)的區(qū)域;第四句說(shuō)有些地方士兵多影響大：軍隊(duì)駐扎的地方。第5～7句說(shuō)回重點(diǎn)，也就是what，到底有哪些影響：軍營(yíng)先要征地;然后會(huì)搶走當(dāng)?shù)仡I(lǐng)導(dǎo)參與政府的機(jī)會(huì);之后社會(huì)發(fā)展受阻，人民不滿而反抗，最后軍事鎮(zhèn)壓。

　　首段的第1句話，雖然句子很長(zhǎng)，但其實(shí)只需要抓住結(jié)構(gòu)層次進(jìn)行分析就能找到閱讀重點(diǎn)。

　　所以總共7句話的段落，分層三個(gè)層次，主旨句+前提說(shuō)明+重點(diǎn)闡述。事實(shí)上，段落第1句就完成了background+introduction雙重目的：英國(guó)被羅馬帝國(guó)征服+ 士兵的營(yíng)地/防御工事以及參與當(dāng)?shù)亟?jīng)濟(jì)所造成的影響。

　　Economic exchange was clearly very important as the Roman army brought with it very substantial spending power. …… Such activities had a major effect on the local area, in particular with the construction of infrastructure such as roads, which improved access to remote areas.

　　第二段一開(kāi)始就交代了經(jīng)濟(jì)交換的影響：強(qiáng)大的購(gòu)買力，以及幫助修建基礎(chǔ)設(shè)施。

　　Each soldier received his pay, but in regions without a developed economy there was initially little on which it could be spent. …… These settlements acted like small towns, becoming centers for the artisan and trading populations.

　　第三段還是在講經(jīng)濟(jì)：剛來(lái)的時(shí)候士兵有錢沒(méi)地方花;最后軍隊(duì)駐扎地變成了小鎮(zhèn)。

　　The army also provided a mean of personal advancement for auxiliary soldiers recruited from the native peoples, as a man obtained hereditary Roman citizenship on retirement after service in an auxiliary regiment. …… By the later Roman period, frontier garrisons (groups of soldiers) were only rarely transferred, service in units became effectively hereditary, and forts were no longer populated or maintained at full strength.

　　第四段開(kāi)始講另一個(gè)重大影響：當(dāng)?shù)厝送ㄟ^(guò)當(dāng)兵獲得可繼承的羅馬公民地位。

　　This process of settling in as a community over several generations, combined with local recruitment, presumably accounts for the apparent stability of the British northern frontier in the later Roman period. It also explains why some of the forts continued in occupation long after Rome ceased to have any formal authority in Britain, at the beginning of the fifth century A.D. The circumstances that had allowed natives to become Romanized also led the self-sustaining military community of the frontier area to become effectively British.

　　第五段，做了個(gè)小總結(jié)，講這種融合過(guò)程及當(dāng)?shù)卣心即龠M(jìn)了北部邊境的穩(wěn)定。

　　通過(guò)上文實(shí)例講解，相信大家對(duì)于托福閱讀說(shuō)明文的基本結(jié)構(gòu)和解題思路也有了一定了解。更多托福干貨敬請(qǐng)關(guān)注聽(tīng)力課堂托?？荚囶l道。