And why do scientists need to study ice from the Alps, for example? Ice formed on the top of a mountain is made of snow accumulated over thousands of years. Trapped air bubbles (气泡) contain samples of the atmosphere that existed when that ice was formed. Ice is a record of climate By examining ice. we know carbon dioxide in the atmosphere is higher now than in the last three million years. Researchers use this kind of data to build computer models and try to predict what might happen in the future.

　　The ice vault will be housed in a snow cave at the Concordia Research Station, which is operated by scientists from France and Italy. The ice samples will be sealed in bags and placed 10 meters below the surface. at a constant temperature of -50*C. This will put the scientists’ minds at rest. Losing the ice samples would be a disaster, and nobody wants to see a mine of scientific knowledge lost forever in a giant pool.

　　32. What makes Antarctica a safe place to store ice?

　　A. Its large mountains.

　　B. Its function as a freezer.

　　C. The abundant ice samples there.

　　D. The absence of global warming.

　　33. Jerome compares ice with rocks and tree rings to state that_.

　　A. it's necessary to store ice

　　B. it’s more valuable to study ice

　　C. ice disappears very quickly

　　D. ice should be stored at home

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