75.Line 3 of the Chengdu Metro, which opened on 31 July,2016, has brought great c to the students and teachers of our school.
convenience
句意为：2016年七月31日开放的成都地铁三号线，给我们学校的师生带来了极大的便利。convenience,名词，方便，便利。
此题考查对语境的理解．准确理解语境，根据首字母确定单词。
句意理解不到位，词汇掌握不准确。