题目内容
The hole in the Earth's ozone layer (臭氧层) has until now protected Antarctica from the worst effects of global warming. But scientists have warned that as the hole closes up in the next few decades, temperatures on the continent could rise by around 3℃on average, with melting ice contributing to a global sea level increase of up to 1.4 metres.
In the past decades the western Antarctic has seen rapid ice loss as the world has warmed, but the other parts of the continent have, paradoxically, been cooling, resulting in a 10% increase in ice in the seas around the region. This is because the hole in the ozone layer has increased cold winds in Antarctica, making much of the continent surface colder than usual.
But now that the gasses that cause the ozone hole have been banned, scientists expect the hole to repair itself within the next 50 to 60 years. By then the cooling effect will have faded out and the Antarctic will face the full impact of global warming. This means an increase in average air temperatures of around 3℃ and a reduction in sea ice by around a third.
The biggest threat to the continent comes from warming seas. Robert Johnson, a scientist who monitors Antarctica ice sheets, said, "The ice sheets in Antarctica are hundreds of metres thick. But once warm ocean waters start flowing underneath, the ice will begin thinning and could break up very quickly. "Thinning ice sheets cause ice to break away from the continent and to melt even faster. Escaping ice from western Antarctica has already resulted in a 10% rise in global sea level in recent decades.
Johnson believes that international action to reduce global warming is required immediately or it may be too late. "Everything is connected - Antarctica may be a long way away but it is an important part of the Earth's system," said Johnson. "It contains 90% of the world's ice, 70% of the world's fresh water and that is enough, if it melts completely, to raise sea levels by 63 metres."
Even in a worse-case situation scientists don't expect the ice to entirely disappear, but predict that, because of the melting ice sheets, average sea level rise will be around 1.4 metres higher by the end of the century.
63. The underlined word "paradoxically" (in Paragraph 2) most probably means "__".
A. rapidly B. approximately C. contradictorily D. apparently
64. What is the effect of the hole in the ozone layer on Antarctica?
A. It is causing the ice to melt faster.
B. It is making much of the continent colder.
C. It is making the effects of global warming in the region worse.
D. It is reducing the amount of water in Antarctica.
65. What do scientists think is the biggest danger facing Antarctica?
A. Rising sea levels. B. Warming sea water temperature.
C. Water pollution. D. Growing ice sheets.
66. Which of the following is true according to the passage?
A. Antarctica is currently experiencing the full effects of global warming.
B. The average temperature has increased by 3℃ in recent decades.
C. Antarctica contains most of the world's fresh water.
D. Ten percent of Antarctica's ice has already been lost.
63-66. CBBC
【解析】略
The Pecan Thief
When I was six years old, I was visiting my grandfather's farm in Kansas. Grandpa had sent me into the 36 to gather pecans for us to enjoy later.
Pecan picking was really 37 work and my little basket was only half full. I wasn't about to 38 Grandpa down. Just then something caught my 39 . A large brown squirrel was a few feet away. I watched as he picked up a pecan, hurried to a tree and 40 in a large hole in the trunk. A moment later the squirrel 41 out and climbed down to the ground to pick up another nut. Once again, he took the pecan back to his hiding place.
Not so 42 anymore, I thought. I dashed over to the tree and looked into the hole. It was 43 with pecans! Golden pecans were right there for taking. This was my 44 . Handful by handful, I scooped all of those pecans into my basket. Now it was full! I was so 45 of myself. I couldn't wait to show Grandpa all the pecans. 46 , I ran back and shouted, “Look at all the pecans!” He looked into the basket and said, “Well, well, how did you find so many ? ” I told him how I'd 47 the squirrel and taken the pecans from his hiding place.
Grandpa congratulated me on how smart I'd been in observing the squirrel and his habits. Then he did something that 48 me. He handed the basket back to me and put his arm gently 49 my shoulders.
“That squirrel worked very hard to gather his winter 50 of food, ” he said. “Now that all of his pecans are gone, don't you think that little squirrel will 51 the cold winter? ”
“I didn't think about that,” I said.
“I know, ” Grandpa said. “But a good man should never take 52 of someone else's hard work.”
Suddenly I felt a bit 53 . The image of the starving squirrel wouldn't 54 my mind. There was only one thing I could do. I carried the basket back to the tree and poured all the nuts into the hole.
I didn't eat any pecans that night, but I had something much more filling—the 55 of knowing I had done just the right thing.
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