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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)

阅读理解

    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.

(1)、Frogs are good at being heard but not seen because     .
A、they can not jump high B、they can hide easily C、they are not active enough D、they have bright colors
(2)、Frogs need to call loudly to      .
A、drive away other species B、tell friend from enemy quickly C、be heard by other frogs D、feel the footsteps of a larger animal
(3)、What can we learn from the passage?
A、Frogs always sing the same notes at different volumes. B、Frogs stay safe in a dangerous world only by their calls. C、Some frogs call accidentally at different times of night. D、Some details of frogs' communication still leave unknown.
(4)、Which is probably the best title of the passage?
A、Frog Songs B、Life of Frogs C、Frog Secrets D、World of Frogs
举一反三
 阅读下列短文,从每题所给的四个选项(A、B、C和D)中选出最佳选项

On May 5,2017, China's home-made passenger aircraft C919 completed its 90-minute first flight and landed safely back at Pudong Airport in Shanghai. 

C919 is developed by COMAC, a Chinese aircraft company. It is designed to compete with Boeing 737 and Airbus A320. The first C919 aircraft can carry 168 passengers and is able to fly a distance between 4, 075 and 5, 555 kilometers. It's reported that a C919 costs around 50 million dollars, less than half of a Boeing 737 or an Airbus A320. Up to now, more than 570 aircrafts have been ordered from 23 customers,mostly Chinese,but also American and Thai companies or airlines. COMAC aims to take one fifth of the world's narrow-body aircraft market and one third of the Chinese market by 2035. 

The name C919 has its special meanings. The letter C stands for both "COMAC" and "China". The number 9 is pronounced as jiu in Chinese, which means "forever". And the number 19 refers to its capacity (容量)of 190 passengers. 

The large passenger aircraft is praised as "the flower of modern industry". It is a symbol of the nation's industrial and technological standards as well as the comprehensive (综合的)power. In order to realize the century dream of flying in the sky and the strategy (战略)of the nation, COMAC bears the nation's dream and people's trust. China considers it as a national pride. 

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