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.
be | but | difficult | fun | go | one |
play | she | teacher | thank | too | useful |
Boys and girls, what sport do you like? Do you like skiing (滑雪)? It looks very{#blank#}1{#/blank#}, but Gu Ailing does it well.{#blank#}2{#/blank#}was born(出生) on September 3rd, 2003, in the USA. Her father is from the USA{#blank#}3{#/blank#}her mother comes from Beijing, China. Gu knows much about China because she{#blank#}4{#/blank#}to China every year. Her grandma is her Chinese{#blank#}5{#/blank#}. Gu thinks Chinese is very{#blank#}6{#/blank#}because she wants to live in China.
Gu is a good skiing{#blank#}7{#/blank#}. Gu gets two gold medals(金牌) in the 2022 Beijing Winter Olympics. She is the{#blank#}8{#/blank#}Chinese to do so. Now, she is a big star. She says, "I love skiing because I am happy when I go skiing. I can have new friends when I go skiing,{#blank#}9{#/blank#}." After the game, Gu says she wants{#blank#}10{#/blank#}her family. Gu is right because family is everything.
Picnic plan(计划) | ||
Time: January,26th | Place: Wuxi Park | People: students in Class 2,Grade 7 |
What they will take? | Lingling | cups,juice |
Wang Wei | a camera,vegetables | |
Li Le | chicken,a knife,water | |
Zhou Ming | hamburgers,apples |
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