题目内容：

    Antarctica(南极洲) is known for being a vast land of ice and snow, a place too cold for most life. Despite (尽管) this, the continent is slowly starting to turn warm. According to the Guardian, the Antarctic has registered (登记) a new high temperature for the first time on record, prompting fears of climate instability(不稳定性) in the world’s iciest place.

On Feb 9, Brazilian researchers at Seymour Island reported a temperature of 20.75℃ on the icy continent of Antarctica. It was almost a full degree higher than the previous record of 19.8℃, taken on Signy Island in January 1982.

This record-breaking reading was taken at a monitoring (监测) station in the northern part of Antarctica. According to Brazilian soil scientist Carlos Schaefer, the temperature was documented during a 20-year-long research project. The focus of this project is to study the effect that climate change has on the permafrost (永久冻土) within the region. Permafrost is soil that stays frozen for at least two years. Although this is a first record high for Antarctica, Schaefer stressed that “We can’t use this to anticipate (预测) climatic changes in the future. It’s simply a signal that something different is happening in that area.”

But in fact, the last high temperature reading was in the 19℃ range. These higher temperatures can cause ice and glaciers (冰川) in Antarctic regions to melt. The Antarctic peninsula (半岛) —the long finger of land(狭长地带) that stretches towards Argentina（阿根廷）—is most dramatically affected. Scientists saw glaciers that have retreated by more than 100 meters in Discovery Bay where the snow melted in little more than a week, leaving dark exposed rock. This melted ice leads to a rise in sea levels that can threaten the safety of coastal areas. It’s believed to be behind an alarming decline of more than 50 percent in chinstrap penguin (帽带企鹅) colonies, which are dependent on sea ice.

Like American writer Ernest Hemingway once said, “The Earth is a fine place and worth fighting for.” We should do everything we can to help save our planet. Otherwise, it may become too hot for us to fix.

1.What did Brazilian researchers report on Feb 9?

A.Signy Island is the warmest region in the Antarctic.

B.Antarctica hit a record high temperature of 20.75℃.

C.The average temperature of Antarctica ranges from 19.8 C to 20.75℃.

D.Antarctica’s new record temperature is a full degree higher than the previous decade.

2.What’s the main purpose of the 20-year-long research project?

A.To predict possible climatic change in the future.

B.To monitor Antarctica’s contributions to world climate change.

C.To explain why the permafrost may cause glaciers to melt.

D.To examine how the permafrost is influenced by climate change.

3.What does the underlined word “retreated” probably mean?

A.Moved backward. B.Increased in size.

C.Covered a certain area D.Stretched in an opposite direction.

4.According to the text, the melted glacier may lead to________.

A.the pollution of ocean water B.the release of various viruses

C.threats to penguin habitats D.disappearances of coastal cities