2018年6月英语六级听力真题-第2套-录音1

【真题完整试卷在”公-重-浩“：超能资料库】

听力试题、听力原文、答案：

一、听力试题：

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、听力原文

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

【翻译】

美国研究人员发现了世界上最古老的人工铺就的公路，有4600年的历史。

这条路连接了埃及沙漠中的一个采石场和几条运送石块至尼罗河沿岸纪念遗址的水路。

这条八英里长的路比以往发现的任何一条路至少早500年。

美国地质调查局的地质学家托马斯·鲍恩表示，这是在古埃及发现的唯一一条铺好的路。

周五，他报告了这一发现。

“这条路比不上金字塔的建筑壮举，

但是一项重大的工程成就，他的同事、托莱多大学的地质学家詹姆斯·哈勒尔说道。

“不仅这条路比我们想象的要早，而且我们甚至没想过他们会修路。”

研究人员在该公路北端的采石场中发现了埃及人使用岩石锯的第一个证据，

这是人们用锯子来切割石头最古老的例子。

“我们不知道他们有这两种技术，”哈勒尔说。

“我们不知道为什么这些技术都被弃用了。”

这条路是在开罗西南约45英里的法尤姆洼地发现的。

鲍恩说，早期的探险者已经观测过这条路的一小段，

但他们没有意识到它的重要性，也没有继续观测

鲍恩和他的同事在该地区进行地质测绘时偶然发现了这条路。

修建这条路显然是为新发现的采石场服务的。

鲍恩和哈勒尔已经找到了采石场工人的营地。

今天看来，这条路哪儿也通不了，终点就是沙漠中央。

这条路原先建成时的终点是莫尔里斯湖岸边的一个码头，

海拔约66英尺，和码头一样高。

每年，莫伊里斯湖从尼罗河的洪水中获得水源。

洪水来临时，

莫伊里斯湖和尼罗河在同一水平面上，并且通过现代el-Lahun和Hawara村庄附近山脉的一个裂口连接。

哈勒尔和鲍恩认为，旱季，装载到驳船上的石块

随后在洪水期间漂流至尼罗河，运至吉萨和萨卡拉的纪念遗址所在地。

根据你刚才听到的录音回答16-18题。

问题16：我们从这篇关于世界上最古老的埃及铺砌道路文章中学到了什么?

问题17：研究人员在石坑里发现了什么？

问题18：铺好路面是为了什么目的？