题目

A Game of Light and ShadeIt was a sunny day. I had gone up and down the tower when, outside the door at the foot, a blind man came toward me. In a moment, he disappeared up the stairs. I looked at the sign that said “To the Tower”, and decided to _______ him.I caught up with him in the ticket office. There I was _______ to see the attendant (工作人员) selling him a ticket as if he were any other visitor. Then, with the ticket in one hand and _______ the wall with the fingers of the other, the blind man reached the stairs ________ to the hallway.“That man is blind. What would a blind 17．有的生物个体非常微小，可以直接制成（　　）A．切片B．涂片C．装片D．滴片