The most recent scientific report from the Intergovernmental Panel on Climate Change （IPCC） also notes with concern that the ocean is acidifying because of increased absorption of atmospheric CO2, and thus causing a threat for shell-forming species．Sharp increases in carbon dioxide levels will cause further acidification of the ocean．

　　Currents distributing heat

　　Another important role the oceans play is that of distributor．Oceans deliver heat and life-sustaining nutrients around the globe．Just as blood vessels bring oxygen and nutrients to cells in the human body, the ocean’s currents carry oxygen, nutrients and heat throughout the Earth．The ocean distributes 25 to 50 percent of the energy the planet receives from the sun．For example, the Gulf Stream carries heat across the Atlantic．This warm current gives northwestern Europe a milder climate than it would normally have so far north．A change to the ocean’s circulation （循环） patterns could throw Europe into a colder period, even as the rest of world experiences warmer temperatures．

　　67．We can infer from the passage that _____．

　　A．the oceans cause global warming

　　B．the oceans stop global warming

　　C．the oceans release nutrientsand heat D．the ocean ecosystems face more dangers

　　68．From the passage we can learn that the ocean’s currents _____．

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