题目

 Although it is not our normal _____ to give credit, this time I think we should consider the matter more closely.   A. state             B. intention              C. occasion             D. practice 答案：【解析】D. 考查名词词义辨析。 practice  做法, 惯例 。手足口病是由肠道病毒引起的传染病，多发于婴幼儿，肠道病毒与大肠杆菌最明显的区别是(　　)A.有无核膜B.有无细胞壁C.有无细胞结构D.有无遗传物质