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.
Model II has been put into mass production. So Model I will soon be obsolete.（）
参考答案
正确答案：
试题解析
out of use 不再被使用；obsolete 过时的。
模型二已投入批量生产。所以模型一很快就会过时。