问题
选择题
Unlike watching TV, reading is a highly active process _______ it requires attention as well as memory and imagination.
A．until
B．but
C．unless
D．for
答案
答案：D
检查考生对逻辑关联用语的掌握和运用能力。for引导的是并列分句。功能ⅰ）对前面的分句加以解释，ⅱ）说明推断的理由，for引导的句子只能后置。