题目

Housed in Milan, one of Europe's dirtiest cities, Leonardo da Vinci's masterpiece The Last Supper still faces a threat from air pollution, researchers say, despite preventative measures that have significantly decreased pollutants in the church where the famous painting is on display. In 2009, Italian authorities installed a heating, ventilation (通风) and air­conditioning system to protect the painting from Milan's polluted air. To see whether the system could improve air quality, a team of researchers led by Constantinos Sioutas, a professor of civil and environmental engineering a17、在中英《南京条约》中，中国被割让的岛屿是       A．台湾岛                 B．辽东半岛              C．海南岛                D．香港岛