题型：阅读选择 题类：模拟题 难易度：困难
北京市海淀区2019届九年级下学期英语期末练习（二模）试卷
On July 20, 1969, Neil Armstrong became the first person to walk on the moon. The space suit Armstrong wore on his lunar mission has come to symbolize courage and human achievement. In 1971, the Smithsonian's National Air and Space Museum(NASM), in Washington, D.C., acquired (获得) Armstrong's suit. It stood proudly on display for visitors to admire, until there were changes in the suit's appearance. "Over time, the suit started to show signs of deterioration," Lisa Young said. Young is an objects conservator (文物修复员) at NASM. It is her job to preserve(维护)historical and cultural objects.
"Plastics are tricky to conserve," Young says. They tend to degrade (降解)over time. Neoprene is one type of plastic in Armstrong's suit. The material can turn brittle and break into tiny pieces. This would ruin the space suit. NASM, seeking ways to preserve this historical treasure, removed it from display in 2006.
What causes plastic to degrade in the first place? "Many things," Odile Madden says. Madden is a scientist in California. She explains that sunlight, water, humidity, and dust can cause plastics to degrade. "Some plastics will break down no matter what we do," Madden says.
Yet history can still be saved. Scientists have found that storing plastics in cooler temperatures, with lower humidity levels, can slow degradation. Young says Armstrong's suit is currently in storage at a temperature of 63°F and a lower relative humidity of 30%. These conditions will be maintained when Armstrong's suit returns to a museum display case in time for the 50th anniversary of the moon landing.
Plastic degradation affects art, too. Artist Claes Oldenburg created False Food Selection in 1966.It consists of plastic food displayed in a wooden box. The plastic food used to look real. Now, some of it has flattened and yellowed. Georgina Rayner is a conservation scientist at Harvard Art Museums, in Cambridge. She says the artwork's wooden box produces an acidic (酸的) gas that eats away at the plastic. This speeds up the degradation process. But Rayner is motivated to conserve this artwork and others like it. "Plastics are a part of our history," she says. "It's important to preserve them so that future generations can understand the journey we've taken."
Jane Goodall was born in London. When she was one year old, her mother took her to the zoo to see chimps (猩猩). {#blank#}1{#/blank#}
When she was seven years old, she read a book about a doctor who could talk to animals. Then she wanted to be able to talk to animals, too. Her favorite animal was chimps.
When she was twenty-six years old, She went to Africa with all her money.{#blank#}2{#/blank#} In Gombe National Park of Africa, she watched them carefully day after day.
{#blank#}3{#/blank#}So she had to watch them far away. After three or four months, the animals accepted her. And then, she went to live in the forests. At last, they became her friends. {#blank#}4{#/blank#}They could think and make plans. They used tools. They could show their feelings when they were happy, sad or mad. She learned their language.
{#blank#}5{#/blank#}She is a very famous scientist in the world.
A. She began to study chimps there instead of going to university. B. Jane Goodall studied chimps for more than forty years. C. She found the chimps acted so much like people. D. Jane began to love the chimps. E. At first, the chimps were afraid of her. |
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