【题目】During this period，many experts warned of mass starvation in the developing world populations were expanding faster than crop production.
A. when B. where
C. which D. why
在线课程【答案】B
【解析】句意：在这期间，许多专家就警告那些人口的增长速度比农作物生产速度快的发展中国家会发生大面积的饥饿问题。分析句子结构可知，空处引导定语从句，“the developing world”为先行词，且在定语从句中作地点状语，故需用where来引导该定语从句。