问题补充：
— How could you my sister so easily in the crowd?
— Because she stood out in her red dress.
A．pick up
B．pick out
C．take up
D．take out
答案：
解析：考查动词词组的用法：A. pick up捡起，习得，染上，收听，B. pick out挑选出，辨认出，C. take up从事，拿起，D. take out拿出，句意是：--在人群中你是怎么容易的认出我姐姐的？--因为她穿红裙子很显眼。选B。
考点; 考查动词词组
