問題詳情
三、閱讀測驗Weather seems to be the most important factor dictating the severity of forest fires.Hot, dry weather lowers the moisture content of fuel. Once a fire has started, wind wouldbecome influential concerning oxygen supply and the rate of spread. Other importantfactors include forest types and forest conditions. For example, fire is more likely to occurin conifers than in hardwoods; slash-covered or brushy areas are especially hazardousbecause the rate at which combustion consumes fuel is related to fuelvolume or surfacearea.Some fires are caused by lightening; others are caused by people. Those caused bypeople may be accidental or intentional. Regional differences exist regarding the causes offire. For example, fires in Rocky Mountains present a different picture from the fires in theSouth. 70 percent of the fires in the former area are caused by lightening, whereasintentional fires take up to 40 percent in the later.
【題組】36. What is the main topic of the passage?
(A) How to reduce the chance of forest fires
(B) Ways to differentiate types of forest fires
(C) Discuss the conditions of forest fires
(D) How to utilize weather information to predict the possibility of forest fires
參考答案
答案：C
難度：適中0.568434
統計：A(38),B(205),C(461),D(81),E(0)
用户評論
【she780718】評論
氣候似乎是主宰森林火災嚴重性的最重要的因素。乾熱的天氣降低了燃料中的水分含量，一旦起火，風對於氧氣提供和擴散速率變得有影養。其他重要因素包括森林的種類和森林的狀況。例如，針葉林比硬木林更可能發生火災；斜線覆蓋或刷狀區域是特別危險的，因為燃燒消耗燃料的速率與燃料體積或表面積有關。有些火災是閃電造成的，有些則是人為造成。那些人為因素可能是意外地或故意的，關於火災的起因存在區域性差異，舉例來說，落磯山脈的火災呈現出與南方火災不同的景象。 前區70％的火災是由閃電引起的，而故意火災在後者中佔40％。
【spreecat】評論
回4F, (b)的意思是區分森林大火的方法可是文章主要是介紹森林大火的非人為因素會依地理環境而不同供你參考一下