TPO31:SAVANNA FORMATION
(2014-02-25 17:45:52)Savanna Formation
1.
a)
b)
c)
d)
解析:prolong 作动词是延长的意思,变成形容词,意思和lengthy应该一样。
2.
a)
b)
c)
d)
解析:段落倒数第二句“Such conditions prevail throughout much of modern South America and Cuba, but many central American savannas as well as coastal areas of Brazil and island of Trinidad do not fit this pattern.”答案选B。
3.
a)
b)
c)
d)
解析:段落倒数两句“This may seem contradictory, but it only means that extreme soil conditions, either too wet or too dry for forests, are satisfactory for savannas. More moderate conditions support moist forests.”意思湿:这看起来互相矛盾,但它意味者极端的泥土条件,比如对森林太湿或者太干,对平原湿没问题的。更温和的条件支持雨林。答案选D。
4.
a)
b)
c)
d)
解析:notably:especially, in particular; 答案选B。
5.
a)
b)
c)
d)
解析:段落第二句“…with a high acidity and notably low concentrations of such minerals as ….and potassium.” 答案选A。
6.
a)
b)
c)
d)
解析:段落第三句“Air cannot penetrate between the soil particles, making the soil oxygen-poor.”选项C正确;根据下一句的by contrast,我们知道之后的内容讲的不是waterlogged soil而是dry soil,选项A是dry soil的特点;选项B错,在上一段的倒数第三句“Some savannas occur on wet, waterlogged soils;”选项D也是dry soil的特点。
7.
a)
b)
c)
d)
解析:最后一句“Though most savannas are found on sites with poor soils, poor soils can and do support lush rain forest.”意思是:尽管大多数平原都在泥土质量比较差的地区,质量差的泥土也能够支持繁茂的雨林。首先,我们要明确,这篇文章讲的是平原的形成,第二段讲的是水分影响平原形成,第三、三段讲的是泥土影响平原形成。最后这一句话说质量差的泥土也能形成繁茂的雨林,这就证明一个地方形成平原,不形成雨林,肯定不是因为泥土质量的问题。所以答案选A。
8.
Frequent fire is a factor to which rain forest species seem unable to adapt, although ancient charcoal remains from Amazon forest soils dating prior to the arrival of humans suggest that most forests also occasionally burn.
频繁的火灾是雨林物种不能适应的因素,尽管在人类到达之前,古代亚马逊森林煤炭残余物表明大多数森林偶尔也会着火。
a)
b)
c)
d)
解析:原句主要是although的让步转折,只有选项D的转折符合。
9.
a)
b)
c)
d)
解析:marked是明显的意思,答案选B。
10. 第五段支持以下哪项关于火灾能够维持平原的陈述? (Factual Information Question)
a)
b)
c)
d)
解析:段落第五句“When burning occurs, it prevents competition among plant species from progressing to the point where some species exclude others, reducing the overall diversity of the ecosystem.”意思是:当燃烧发生时,火灾防止植物竞争进展到一些物种消灭另外一些的程度,导致生态系统整体多样性下降。大家要注意,最后reducing the overall diversity of the ecosystem不是火灾造成的结果,而是物种消灭另一些物种造成的结果,所以不能选B。
11. 与单词subsequent在文中意思最接近的是
a)
b)
c)
d)
解析:subsequent:coming after something in time; following; 答案选C。
12. 根据第六段,人类活动用以下方式影响了泥土,除了
a)
b)
c)
d)
解析:段落第三句“The thin upper layer of humus is destroyed by cutting and burning.”对应选项C;第五句“Once the humus layer disappears, nutrients cannot be recycled and leach from the soil.. ”对应选项B;第五句后半段“…converting soil from fertile to infertile and making it suitable only for savanna vegetation.”对应选项D;答案选A。
13. Look at the four squares ■that indicate where the following sentence could be added to the passage.
In addition, humans have contributed to the condition favoring the formation of savannas.
解析:答案选C;因为最后一段的内容讲的时人类活动对平原形成的影响;正好这句话作为总起句,In addition也承接上文,这样起到承上启下的作用。
14.
Several factors seem to play important roles in savanna formation.
a)
b)
c)
d)
e)
f)
解析:选项A错,原文没有more commonly的比较
选项B对,泥土压力在第二段讲到,极端湿润在第三段讲到,低营养水平第四段讲到,所以这句话概括了这三段的内容
选项C错,原文没提到
选项D错,这个比较原文没提到
选项E对,概括了倒数第二段的内容
选项F对,概括了最后一段的内容
答案:BEF

加载中…