目前实验室中已开始应用2008 年诺贝尔化学奖的研究成果，即依据生物发光现象检测超微量钙的存在。这里的“钙”指的是[ ]

A．原子        

B．元素        

C．分子        

D．离子

Norway is, quite naturally, paying great attention to developments in Europe and in the Atlantic community, which are so instrumental to the maintenance of peace and security in our part of the world.