2. (2018重庆A卷)Meimei is going to be an older sister. Her parents are planning to have their________ child.
A. one  B. two  C. first  D. second
2.  D【解析】考查序数词。句意：梅梅将要成为姐姐了。她的父母正计划生他们的 的孩子。由句意可知此处表示“第二个”孩子，应该用序数词，故选D。