People take naps at noon in warmer climates, the heat makes work difficult in the early afternoon.
A. which
B. what
C. where
D. when
网友回答
A. which
B. what
(答案→)C. where
D. when
解析：句意：人们在气候温暖的中午会打盹。在这种气候里，高温会使得下午的工作很困难。句子分析看，非限定语从句中已有时间状语，亦不缺主语和宾语，故用关系副词where作状语。