标题: 求助MANHATTAN上的一道题,关于in contrast to [打印本页] 作者: cher6068 时间: 2012-12-16 07:35 标题: 求助MANHATTAN上的一道题,关于in contrast to
Antigenic shift refers to the combination of two different strains of influenza; in contrast, antigenic drift refers to the natural mutation of a single strain of influenza.
A. influenza; in contrast, antigenic drift refers to the natural mutation of a single strain of influenza
B. influenza, different than the natural mutation of a single strain, known as antigenic drift
C. influenza, in contrast to the natural mutation of a single strain, known as antigenic drift
D. influenza, different than antigenic drift, which refers to the natural mutation of a single strain of influenza
E. influenza; in contrast to antigenic drift, which refers to the natural mutation of a single strain of influenza