托福阅读事实信息题是阅读考试中比较常见的一种题型，tpo则是托福阅读备考最权威的材料，所以托福小编综合二者，为大家集中整理了tpo阅读中考察的事实信息题及其对应的解析，供大家参考使用。本文带来的是TPO17-2的事实信息题，一起来看看吧。
TPO17-2 Animal Signals in the Rain Forest
paragraph 2
In the varied and constantly changing light environment of the forest, an animal must be able to send visual signals to members of its own species and at the same time avoid being detected by predators. An animal can hide from predators by choosing the light environment in which its pattern is least visible. This may require moving to different parts of the forest at different times of the day or under different weather conditions, or it may be achieved by changing color according to the changing light conditions. Many species of amphibians (frogs and toads) and reptiles (lizards and snakes) are able to change their color patterns to camouflage themselves. Some also signal by changing color. The chameleon lizard has the most striking ability to do this. Some chameleon species can change from a rather dull appearance to a full riot of carnival colors in seconds. By this means, they signal their level of aggression or readiness to mate.
2. According to paragraph 2 what is problematic about an animal s sending visual signals to members of its own species?
signs that make an animal visible to its species also make it visible to predators
an animal that changes color to avoid predators can confuse members of its species
changing light may require an animal to move beyond the visual range of other members
the animal may mistakenly signal aggression when it meant to signal readiness to mate.
解析：以members of its own species做关键词定位至第一句，说动物给自己的同类发信号的时候必须同时避免被天敌看到，所以答案是A，动物的信号也会被捕食者看到。B的change colours，C的beyond the visual range和D的signal aggression原文都没说
【2】在多样和不断变化的森林光照环境下，动物必须能够发送视觉信号给自己的同类，同时避免被捕食者发现。动物可以选择最不易看得见的光照环境来躲避捕食者的视线。这就要求动物能在白天不同的时间或者在不同的天气条件下移动到森林的不同方位，或者，它们也可以根据不同的光照来改变自身的颜色。很多两栖动物(青蛙和蟾蜍)和爬行动物(蜥蜴和蛇)都可以通过改变颜色图案来伪装自己。有些动物还通过改变颜色来发出信号。变色龙在这方面有着最惊人的能力。有些变色龙物种可以在几秒钟之内就把暗淡的外表变得灿烂夺目。通过这种方式，它们可以传达出攻击程度和交配意愿。
paragraph 3
Other species take into account the changing conditions of light by performing their visual displays only when the light is favorable. A male bird of paradise may put himself in the limelight 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 and display by opening and closing their beautifully patterned wings in the bright spotlights They also compete with each other for the best spot of sunlight.
5. According to paragraph 3. butterflies move into spots of sunlight in order to
warm their wings in order to open them
compete with each other
take advantage of favorable light conditions
on the forest floor
imitate birds of paradise
解析：以butterfly做关键词定位至第三句，说蝴蝶move into并且display blabla，但这句话没说为什么蝴蝶要move，最后一句非常清楚地说蝴蝶会彼此竞争最好的阳光，也就是C说的利用光线条件，所以答案是C，B虽然说了compete，但没说compete什么，所以不对，其他的都是单纯说事件没说原因，所以不对
【3】其他的物种则只有在光照对它们有利的时候才会利用光照，来进行视觉上的自我展现。雄性极乐鸟会置身于汇聚的光线之下，在最佳的场景中展现自己缤纷绚烂的羽翼，以吸引雌鸟的注意。某些蝴蝶则飞到穿透森林的太阳光点处，，在明亮的光点中扇动着带有美丽图案的翅膀来展现自己。它们还会互相争夺最佳的光照位置。
paragraph 4
Very little light filters through the canopy of leaves and branches in a rain forest to reach ground level—or close to the ground—and at those levels the yellow-to-green wavelengths predominate. A signal might be most easily seen if it is maximally bright. In the green-to-yellow lighting conditions of the lowest levels of the forest, yellow and green would be the brightest colors, but when an animal is signaling, these colors would not be very visible if the animal was sitting in an area with a yellowish or greenish background The best signal depends not only on its brightness but also on how well it contrasts with the background against which it must be seen. In this part of the rain forest, therefore, red and orange are the best colors for signaling, and they are the colors used in signals by the ground-walking Australian brush turkey. This species, which lives in the rain forests and scrublands of the east coast of Australia, has a brown-to-black plumage with bare, bright-red skin on the head and neck and a neck collar of orange-yellow loosely hanging skin. During courtship and aggressive displays, the turkey enlarges its colored neck collar by inflating sacs in the neck region and then flings about a pendulous part of the colored signaling apparatus as it utters calls designed to attract or repel. This impressive display is clearly visible in the light spectrum illuminating the forest floor.
6. According to paragraph 4, what is true about light that reaches ground level?
It reveals only the yellow and green colors animals use to signal each other.
It reflects the yellow and green colors to make the floor as bright as sunshine
It camouflages animals whose natural colors are yellow and green
It consists mostly of yellow-to-green wavelengths
解析：以light that reaches ground level做关键词定位至第一句，说到达地面的光以黄绿波长的为主，D是原文的忠实改写，其他都没说，关键词定准后只读一句话就可以又快又好拿出答案
【4】很少有光能够穿透热带雨林的树冠层到达地平面——或是接近地面——而能达到底部的主要是黄绿光波。如果是色彩极为明亮的信号，可能更容易被看见。在森林底层的黄绿光照条件下，黄色和绿色是最明亮的颜色，但是当动物发送信号时，如果处于浅黄或浅绿的背景下，这些颜色就不容易看到了。最佳的信号不仅取决于其明亮度，还在于它与背景颜色的对比度。因此，在热带雨林这块区域，红色和橙色是最佳的信号颜色，而这也是地面行走的澳大利亚灌丛火鸡最善于使用的信号颜色。这个物种生活在澳大利亚东海岸的雨林和灌木丛中，长着黑棕色的羽毛，有着光秃秃、亮红色的头和脖子，颈圈上是一层橙黄色的松垮垮的皮。在求爱期和发起进攻时，火鸡通过给颈部液囊充气扩张颈圈，晃动着下垂的鲜艳的信号装置，随之发出叫声来吸引异性或击退敌人。在照亮雨林底层的光谱环境下，能够清晰地看到这种让人印象深刻的展示。
以上就是托福阅读TPO17-2中的事实信息题及其解析，大家可以在备考的时候参考复习，希望能够帮助大家的考前准备。最后前程百利祝大家都能取得理想的托福考试成绩。
您还可能关注：
