课程咨询

托福考试网 托福资料下载 托福资讯 0元讲座 水平测试

托福考试练习
新东方在线 > TOEFL > 托福阅读 > 正文
托福培训

扫码免费领资料

托福全科备考资料

免费水平测试及规划

托福培训

扫码关注掌握一手留学资讯

回复XDF免费水平测试

录播精讲 直播课HOT

托福阅读背景知识之动物发声

2015-01-09 19:46:57来源：网络

　　2015年托福考试已经来临，对于每一位参加托福考试的同学来说都是新的开始，那么我们对于托福听说读写都需要采取怎样的复习方法?下面是新东方在线托福小编整理的托福阅读背景知识之动物发声，供同学们参考!

　　讲的是动物、昆虫的发声的问题。

　　最开始怎么说的记不清楚了，第一层应该就是rainforest里面的小东东怎么让声音传播。热带雨林里面这么吵，要让同类听到自己还是很不容易的，尤其对于那些小昆虫什么的，而且很多小东西通过发声来求偶交配嘛，你们都懂的!!!Rain forest这里举了一个树蛙的例子，就是这小青蛙用的一种招数，它一般会进到有水的树洞， 身体一部分没入水中，然后开始发声，找到与大树能共鸣的频率，这不就能传的更高更远嘛。(有排除题)

　　下面一层应该是讲birds，同时提到了它们叫的时间一般是在早上和黄昏，那个时候声音能传得更远， 但是有些时候也会让天敌们发现之类的(没记错的话，最少有俩道题)

　　最后一层应该是提到了不同物种的发声频率不同，这能让它们被分辨出来。还有一个教授，把声音录下来回去分析，发现每个雨林的声音还不太一样，也是unique的，甚至可以像人类的指纹一样去分辨树林的独特声音什么的(有题)。

　　相关背景知识：

　　The daytime quality of light in forests varies with the density of the vegetation, the angleof the Sun, and the amount of cloud in the sky. Both animals and plants have differentappearances in these various lighting conditions. A color or pattern that is relatively indistinctin one kind of light may be quite conspicuous in another.

　　In the varied and constantly changing light environment of the forest, an animal must beable to send visual signals to members of its own species and at the same time avoid beingdetected by predators. An animal can hide from predators by choosing the light environmentin which its pattern is least visible. This may require moving to different parts of the forest atdifferent times of the day or under different weather conditions, or it may be achieved bychanging color according to the changing light conditions. Many species of amphibians (frogsand toads) and reptiles (lizards and snakes) are able to change their color patterns tocamouflage themselves. Some also signal by changing color. The chameleon lizard has themost striking ability to do this. Some chameleon species can change from a rather dullappearance to a full riot of carnival colors in seconds. By this means, they signal their level ofaggression or readiness to mate.

　　Other species take into account the changing conditions of light by performing their visualdisplays only when the light is favorable. A male bird of paradise may put himself in thelimelight by displaying his spectacular plumage in the best stage setting to attract a female.Certain butterflies move into spots of sunlight that have penetrated to the forest floor anddisplay by opening and closing their beautifully

本文关键字: 托福阅读背景知识

上一页 1 2 下一页

托福辅导

关注新东方在线托福

托福机经·Official题目练习

考前重点突破·听说读写海量资料

更多资料

关注新东方在线托福，
回复【XDF】获取大礼包

托福辅导
  • 1.打开手机微信【扫一扫】，识别上方二维码；
  • 2.点击【添加】，回复对应关键字领取学习资料。
更多>>
更多内容

免费获取托福备考大礼包

微信扫描下方二维码 立即领取

托福辅导
更多>>
更多公益讲座>>
更多>>
更多资料
托福TPO 托福听力练习 托福口语练习 托福阅读练习 托福写作练习
我要
反馈 返回
首页
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10