The upside-down catfish is the only fish that（ ）swims on its back.
A、
habitually
B、
traditionally
C、
commonly
D、
randomly
【正确答案】：A
【题目解析】：
A项意为“习惯性地”；B项意为“传统地”；C项意为“一般地；通常地”；D项意为“随便地，任意地”。根据句意，答案应为A。句意：鲶鱼是唯一在游动时习惯性地背朝下的鱼。
The upside-down catfish is the only fish that（ ）swims on its back.
The upside-down catfish is the only fish that（ ）swims on its back.
habitually
traditionally
commonly
randomly
A项意为“习惯性地”；B项意为“传统地”；C项意为“一般地；通常地”；D项意为“随便地，任意地”。根据句意，答案应为A。句意：鲶鱼是唯一在游动时习惯性地背朝下的鱼。