C．Protecting medical staff

　　D．Providing special equipment

　　40．Which of the following is NOT true according to the passage?

　　A．Many affected countries have their health systems under severe challenge.

　　B．WHOs attempts to open new Ebola treatment centres are slowing down.

　　C．People show increasing concern about actions taken to fight the disease.

　　D．Efforts are made internationally to help bring the disease under control.

　　C

　　(2015·南京三校联考)Ancient volcanic eruptions in Australia 510 million years ago significantly affected the climate, causing the first known mass extinction (灭绝) in the history of complex life, according to research published in Geology.Professor Jourdan from Curtin University?s Department of Applied Geology, along with colleagues from several Australian and international institutions, used radioactive dating techniques to precisely measure the age of the eruptions of the Kalkarindji volcanic province, where lavas covered an area of more than 2 million km2 in the Northern Territory and Western Australia. The researchers found that the volcanic eruptions happened at the same time as the Early­Middle Cambrian extinction 510511 million years ago — the first extinction to wipe out complex life.

　　“It has been well­documented that this extinction, which eradicated 50% of species (物种), was related to climate changes and reduction of oxygen in the oceans, but the exact process was not known until now，” Jourdan said. “We were not only able to prove that the Kalkarindji volcanic eruptions took place at the exact same time as the Cambrian extinction, but we were also able to measure a reduction of sulfur dioxide (二氧化硫) from the province’s volcanic rocks — which indicates sulfur was released into the atmosphere during the eruptions.”

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