https://online2.tingclass.net/lesson/shi0529/0001/1240/19-01.mp3
https://image.tingclass.net/statics/js/2012
20. Though it was less attractive, John knew the metal box would be more _______.
A. terminal B. durable C. persistent D. ultimate
<babble>
able 能，能够的
babble 胡言乱语
gabble 口齿不清，含糊不清
dabble 戏水，弄水
gobble 狼吞虎咽
nibble 小口吞咽，细咬
fable 寓言
sable 丧服
</babble>
<persistent>
persistent 持久的，固执的，永恒的
stubborn 固执的
obstinate 顽固的
adamant 固执的
eternal 永恒的
perpetual 永恒的
constant 恒定的，常量
permanent 永恒的，永久的
</persistent>
<pledge>
pledge 发誓
hedge 篱笆
ledge 窗台
edge 边缘
</pledge>
