答案：A

题目分析：句意：总的来说与那些熬夜的人相比，那些早起的人对生活感到快乐和满意。whom是宾格；whose在定语从句中定语，这里是定语从句，先行词是those指那些人，这时不能用that引导，而用指人的who来引导，它在从句中做主语，故选A。

点评：本题难度适中。这里考查的关系词的选用，当先行词是he/she/they/anyone /those 时，它们虽指人但是不能用that引导，而用who引导，这一点考生容易忽略。

即学即练：It was two decades ago ______  I was in my teens_________the Chinese government decided to reform the social economic system.

A. when; when    B. that; which     C. when; that    D. before; that

解析：C。考查定语从句和强调句的混用。when引导时间状语从句，强调句型It was ...that对when引导的从句进行强调，故选C。