题型：阅读选择 题类：常考题 难易度：普通
北京市海淀区2017-2018学年八年级下学期英语期末考试试卷（音频暂未更新）
Rik-rrork. That's the sound made by frogs singing at night. You might have thought the noises were just the musical sounds of ure. You probably didn't realize that you were listening to frogs' communicating with one another. These familiar sounds are not random(随意的) but are actually meaningful to frogs.
Being Heard but Not Seen
Frogs are good at being heard but not seen. These animals have several characters that protect them n predators (捕食者 ). One is their size. Most frogs are small, which helps them hide easily. Many frogs have coloring that allows them to hide in their environment, making it difficult for predators to find them. In addition, most frogs are active at night. So it is difficult for most animals to see them in the dark.
Small but Loud
Frogs call to tell other frogs where they are. Their voices can be very loud. But when frogs feel the footsteps of a larger animal, they become silent.
Many of the world's frogs live in rain forests, where there are many different animals calling to their own species (物种 ) in their own ways. Frogs need to call loudly enough to be heard through the noise in order to find other frogs.
Singing with Purpose
Peter Narins is a scientist who studies how frogs call to one another. He has learned that frogs use their calls to help them tell friend from enemy. They sing the same notes at the same volume (音量 ) each time they call. In addition, Narins has found that frogs of the same species always sing the same patterns (模式 ). These patterns are like a code that is different from other animals' calls and difficult for others to copy. Narins also observed that timing plays a role in frog calls. Many frogs call only at a certain time of night.
More Work to Do
Scientists want to better understand the purpose of frog calls. Studies continue to explore the details of frogs' unique communication. Being heard but not seen is one way frogs stay safe. The idea that they have found a way to survive in a dangerous world is simply amazing.
A. In Chinese culture, red lanterns are symbols of happiness. B. They have become a symbol of Chinese culture worldwide. C. It was mainly used in palaces in ancient times. D. The shape was much like that of the palace lanterns. E. However, traditional lanterns are still the most popular ones in people's hearts. |
Lanterns have been part of Chinese culture for centuries and play an important part in many celebrations.
Palace lantern(宫灯)
{#blank#}1{#/blank#} When making palace lanterns, fine wood was used. The palace lanterns were covered with silk or glass. Different kinds of pictures were drawn on the covers. These lanterns were not only used as lights but also as decorations in palaces.
Gauze lantern(纱灯)
Less expensive bamboo and gauze (纱布) were used to cover the lantern. Red gauze was used when making them. {#blank#}2{#/blank#} So red lanterns are always hung on important testivals such as Lantern Festival, Spring Festival and National Day in parks or along main streets. In some famous China towns abroad, you can see red lanterns all the year round. {#blank#}3{#/blank#}
Shadow-picture lantern(走马灯)
It was usually used for amusement. {#blank#}4{#/blank#} There were two layers(层) of covers and pictures were drawn on the inside layer. When the candle was lit, the heat caused a paper wheel inside the lantern to turn around, so that moving pictures appeared on the outside cover.
Now more kinds of lanterns appear in festival s besides the traditional ones. More modern technology is used on making lanterns. There is no doubt that the modern lanterns will be more creative and interesting.
What's the passage mainly about?(请用一句话概括, 不超过20词) {#blank#}5{#/blank#}
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