进入查看： 2022-2023年英语周报七年级第31期答案汇总

 

People might be surprised to see how today's Greenland looked during the last two inter glacial periods. During the Last Inter glacial, global sea levels increased by 15 to 30 feet, largely due to tinning of Greenland and Antarctica's ice sheets.

However, now researchers believe northern Greenland's ice sheet experienced stronger warming than previously thought, which could mean that Greenland is more responsible for that sea-level rise.

Finding lake deposits older than about 10,000 years, however, has been historically very difficult in Greenland. To measure these ancient temperatures, researchers look to ice cores (冰核) and lake deposits. Since ice and lake deposits

form by a gradual buildup on annual layers of snow or mud, these cores contain

history of the past. By looking through the layers, researchers can obtain climate clues from centuries ago.

Why are the remains of flies mentioned in the first two paragraphs?

They serve as evidence that there is still life in the Northwest Greenland.

They were one of the many ancient lives that were left in the Greenland mud.

They are indicators that Greenland was much warmer than previously thought.

They help the researchers realize that there was once a warm period in Arctic.