单选题 ______ ballpoint pen was invented by ______ Hungarian refugee named Lazio Biro.
【正确答案】 B
【答案解析】[解析] 句意：圆珠笔是被一个叫做拉齐奥·比罗的匈牙利难民发明的。ballpoint pen前加the表示特指圆珠笔。