A:So fine was the weather
B:So was the fine weather
C:The weather was so fine wa
D:So the weather was tine
用手指触摸蚯蚓体节近腹面处,有粗糙不平的感觉,用放大镜观察,看到腹面有许多小突起就是____ ,刚毛的作用是____ 。