单选题 As skies are filled with millions of migrating birds, European scientists say the seasonal miracle appears to depend on a seeming______: The fatter the bird, the more efficiently it flies.
【正确答案】 D
【答案解析】解析:句子大意为:天空中有数百万计的候鸟,欧洲科学家说这种季节性的奇迹主要体现在一个似乎矛盾的现象:鸟越肥胖,飞行效率越高。在给出的选项中:interruption“中断”;description“描述”;qualification“资格”;contradiction“矛盾”,该词与原句中解释性分句的意思相符。所以,正确答案是D。