题目

He got seriously ill at the age of five. Later he couldn’t see anything at all. He was ______ blind.A. nearly             B. totally             C. especially         D. probably 答案：D如图，是一个三棱柱的主视图和左视图，其俯视图是正三角形，则图中a的值为（　　）A．6B．33C．23D．3