Unlike watching TV, reading is a highly active process (过程) it requires attention as well as memory and imagination.
A. until
B. but
C. unless
D. for
网友回答
A. until
B. but
C. unless
(答案→)D. for
解析：该题考查连词的用法。前后是因果关系,故用for。句意为:“不像看电视,阅读是一个很主动的过程,因为它除了需要记忆力和想像力外,还需注意力。”