试题题干
Directions: Read each of the following sentences carefully, and choose A,B,C or D that has the closest meaning to the underlined word or phrase.
One important reason for many of the accidents in the nuclear plants is that safety procedures were either inadequate or ignored.（）
参考答案
正确答案：
试题解析
overlooked 被忽视的，与ignored同义。句意：核电站许多事故的一个重要原因是安全程序要么不完善要么被忽视。underestimated低估的；overdone做得过分的；unnoticed未被察觉的。