2018年6月英語六級聽力真題-第2套-錄音1

【真題完整試卷在”公-重-浩“：超能資料庫】

聽力試題、聽力原文、答案：

一、聽力試題：

Recording 1

16. A) They will root out native species altogether.

B) They contribute to a region's biodiversity.

C) They pose a threat to the local ecosystem.

D) They will crossbreed with native species.

17. A) Their classifications are meaningful.

B) Their interactions are hard to define.

C) Their definitions are changeable.

D) Their distinctions are artificial.

18. A) Only a few of them cause problems to native species.

B) They may turn out to benefit the local environment.

C) Few of them can survive in their new habitats.

D) Only 10 percent of them can be naturalized.

二、聽力原文

Recording 1
Government‘s private groups and indivisuals spend billions of dollars a year trying to route out non-native organisms that are considered dangerous to ecosystems and to prevent the introduction of new intruders.
But a number of scientists question the assumption that the presence of alien species can nevr be acceptable in a natural ecosystem.
They say that portraying introduced species as inherently bad is an unscientific approach. “Distinctions between exotic and native species are artificial”，said Dr. Michael Rosenspeek， a professor of evolutionary biology at the University of Arizona.
“Because they depend on pegging a date and calling the plans on animals that show up after the date， exotic.”
Ecosystems free of species to find as exotic are by default consider the most natural.
“You can‘t roll back the clock and remove all the exotics or fix habitats，” Dr. Rosenspeek said， “Both native and exotic species can become invasive，and so they all have to be monitored and controlled when they begin to get out of the hand ”
At its core， the debate is about how to manage the world‘s remaining natural ecosystems and how and how much to restore other habitats.
Species that invade a territory can harm ecosystems，agriculture and human health.
They can threaten some native species or even destroy and replace others.
Next habitat loss，these evasive species represents the greatest threat to bio-diversity worldwide， many ecologists say.
Ecologists generally define an alien species as one that people accidentally or deliberately carried to its new location.
Across the American continents，exotic species are those introduced after the first European contact.
That date rounded of to 15 AD， represents what ecologist considered to have been a major shift in the spread of species including crops and life stock as they began to migrate with humans from continent to continent.
“Only a small percentage of alien species calls problems in their new habitats，”said Don Smith，professor of ecology and evolutionary biology at the Univiersity of Tenacy.
“Of the 7000 alien species in the United States，out of a total of 150 species，only about 10% are invasive，”he pointed out，“The other 90% have fit into their environments and are considered naturalized. ”
“Yet appearances can deceive，”ecologiest caution，“and many these exotics may be considered acceptable only because no one has documented their harmful affects .What is more， non native species can appear harmless then turn invasive.”
16.What assumption about introduced species is challenged by a number of scientists？
17.What does Dr. Michael Rosenspeek think of exotic native species ？
18. What does Professor Don Smith say about alien species？

三、答案

16. C
17. D
18. A

【翻譯】

美國研究人員發(fā)現(xiàn)了世界上最古老的人工鋪就的公路，有4600年的歷史。

這條路連接了埃及沙漠中的一個采石場和幾條運送石塊至尼羅河沿岸紀念遺址的水路。

這條八英里長的路比以往發(fā)現(xiàn)的任何一條路至少早500年。

美國地質(zhì)調(diào)查局的地質(zhì)學家托馬斯·鮑恩表示，這是在古埃及發(fā)現(xiàn)的唯一一條鋪好的路。

周五，他報告了這一發(fā)現(xiàn)。

“這條路比不上金字塔的建筑壯舉，

但是一項重大的工程成就，他的同事、托萊多大學的地質(zhì)學家詹姆斯·哈勒爾說道。

“不僅這條路比我們想象的要早，而且我們甚至沒想過他們會修路?！?/p>

研究人員在該公路北端的采石場中發(fā)現(xiàn)了埃及人使用巖石鋸的第一個證據(jù)，

這是人們用鋸子來切割石頭最古老的例子。

“我們不知道他們有這兩種技術，”哈勒爾說。

“我們不知道為什么這些技術都被棄用了?！?/p>

這條路是在開羅西南約45英里的法尤姆洼地發(fā)現(xiàn)的。

鮑恩說，早期的探險者已經(jīng)觀測過這條路的一小段，

但他們沒有意識到它的重要性，也沒有繼續(xù)觀測

鮑恩和他的同事在該地區(qū)進行地質(zhì)測繪時偶然發(fā)現(xiàn)了這條路。

修建這條路顯然是為新發(fā)現(xiàn)的采石場服務的。

鮑恩和哈勒爾已經(jīng)找到了采石場工人的營地。

今天看來，這條路哪兒也通不了，終點就是沙漠中央。

這條路原先建成時的終點是莫爾里斯湖岸邊的一個碼頭，

海拔約66英尺，和碼頭一樣高。

每年，莫伊里斯湖從尼羅河的洪水中獲得水源。

洪水來臨時，

莫伊里斯湖和尼羅河在同一水平面上，并且通過現(xiàn)代el-Lahun和Hawara村莊附近山脈的一個裂口連接。

哈勒爾和鮑恩認為，旱季，裝載到駁船上的石塊

隨后在洪水期間漂流至尼羅河，運至吉薩和薩卡拉的紀念遺址所在地。

根據(jù)你剛才聽到的錄音回答16-18題。

問題16：我們從這篇關于世界上最古老的埃及鋪砌道路文章中學到了什么?

問題17：研究人員在石坑里發(fā)現(xiàn)了什么？

問題18：鋪好路面是為了什么目的？