Young married girls start child-bearing soon after marriage with increased health risks from complications in pregnancy and death during delivery, low-birth weight, and high risk of ( ) mortality.

　　A.baby

　　B.offspring

　　C.child

　　D.infant

　　【答案】A。结合句意可知空缺处这里特指婴儿。A 项 baby：婴儿的;B 项 offspring： 后代、子孙;C 项 child：孩子;D 项 infant：婴幼儿。Baby 和 infant 之间的区别在于前者是日常用词，常含钟爱的意味。后者是书面用词，常用在法律之中。结合题干的语境可知包含“钟爱”意味的 Baby 更合适，故本题正确答案选 A。