Question

4. Unlike watching TV,reading is a highly active process,          it re quires attention as well as memory and imagination.

Answer 1

4. for for表示原因，意为“由于……，……的原因”，起补充说明的作用。句意：不像看电视，阅读是一个思维高度活跃的过程，因为它不光需要记忆力和想象力，还需要注意力。