单选题 Some psychologists maintain that thinking is ______.

A、 not a mental process
B、 more of a physical process than a mental action
C、 a process that involves our entire bodies
D、 a process that involves the muscles as well as the brain

【正确答案】 D

【答案解析】[注释] 本题考点在文章第一句中的mental acts such as thinking are not performed in the brain alone，but that one's muscles also participate．原文中的not．．．alone，but．．．相当于考题里的as well as，所以考生对意思相似相近的表达要清楚。