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2018年初中英语牛津版(深圳·广州)八年级下册期末模拟试题(2)

作者UID:7914996
日期: 2024-11-08
期末考试
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    Life is full of surprises and you never know how things will turn out.

Sir John Gurdon is a good example of this. As a boy, he was told he was hopeless at science and finished bottom of his class. Now, aged 79, the very same Gurdon shared the 2012 Nobel Prize in Medicine with Japanese stem cell(干细胞) researcher Shinya Yamanaka.

Like so many scientists, Gurdon shows us where the power of curiosity and perseverance(坚持不懈) can lead.

At the age of 15 in 1948, Gurdon ranked last out of the 250 boys at his high school in biology and every other science subject. Gurdon's high school science teacher even said that his dream of becoming a scientist was "quiteridiculous".

In spite of his teacher's criticisms, Gurdon followed his curiosity and kept working hard. He went to the lab early and left later than anyone else. He experienced thousands of failures.

    "My own belief is that we will, in the end, understand everything about how cells actually work." Gurdon said.

    In 1962, Gurdon took a cell from an adult frog and moved its genetic(基因的) information into an egg cell. The egg cell then grew into a clone(克隆) of the adult frog. This technique later helped to create Dolly the sheep in 1996, the first cloned mammal(哺乳动物) in the world.

    In 2006, Gurdon's work was developed by Yamanaka to show that a sample(样本) of a person's skin can be used to create stem cells. Using this technique, doctors can repair a patient's heart after a heart attack.

    "Luck favors the prepared mind, "Gurdon told the Nobel Prize Organization." Ninety percent of the time things don't work, but when they do, you have to seize(抓住) the chance. "

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    Many of us have ever loved the two toy bears-a brown Teddy bear and a yellow Winnie-the-Pooh bear. The two toy bears come from real stories in life.

    In 1902, Theodore Roosevelt, President of the USA, went on hunting. The hunting dogs found an old bear in the forest near Washington DC and the guide asked the president to shoot(射杀) it. But President Roosevelt disagreed. A cartoonist(漫画家) drew a cartoon showing that the president refused to shoot the bear. Soon, the bear began to appear in other newspapers. People named the bear Teddy which was Theodore's nickname(昵称).

    In 1913, a captain named Harry Colebourn paid 20 dollars for a black bear which was born in the Canadian countryside. The captain's hometown, Winnipeg, was the origin(起源) of the bear's name. In Winnipeg, Winnie served as the mascot(吉祥物). When World War I began, the captain went to France. Winnie was sent to London Zoo which many kids often visited. Because of its lovely look, the bear became popular with children.

The Stories about the Two Real

Name

Teddy

Winnie-the-Pooh

Appearing Time

11 years  than Winne

In 1913

Birth Place

America

Origin of the Name

Teddy, the nickname of President Theodore Roosevelt

Winnipeg, the  of Captain Harry Colebourn

Reason for Being Popular

A cartoon showing that the president didn't  with the idea of shooting the bear

The lovely look attracting the attention of children who often went to London Zoo

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    In nature, you may see many insects(昆虫) and animals of different colors. Have you ever wondered why?

    Locusts are super delicious food for birds, but it is not always an easy job for birds to catch them. It is neither because locusts are good jumpers or runners nor because they are smarter than their enemies. The reason is that the colors, of locusts change with the colors of crops(庄稼). When crops are young, locusts look green. But when autumn comes, locusts change to the yellow and brown color as crops do.

    Brown bears, tigers and other animals move quietly through forests. They can't be seen easily by their enemies. This is because they have colors similar to the trees. For the same reason, polar bears that live on a land of snow and ice are white. Butterflies and bees living among the flowers are colorful like flowers. Soil insects are mostly dark colored and they live under the soil(土壤)in a dark and wet environment. However, insects with colors different from plants can easily be found and eaten by others. So in order tosurvive, they have to hide themselves in the daytime and appear only at night.

    Have you ever noticed some even stranger acts? The ink fish in the sea can send out some very black ink when it faces danger. As the ink spreads over, its enemies will find themselves suddenly in a dark world. At the same time the ink fish immediately swims away. That is how it keeps itself safe though it is not strong at all.

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