以下是引用Amelia_He在2006-8-12 11:46:00的发言:0501 19. There is ample evidence of that about 700 million years ago, glaciers reached well into what are now tropical regions.
答案选B。是把of去掉吧!那A呢?为什么不加限定词an呢?
28. Not much is it known about the details of the development and acquisition of primate communication, especially in the wild.
答案选A。怎么改呢?
  
1. evidence is 不可数名词 2. Not much is know about.... btw, I don't think you need to know how to correct the errors just a reminder |