单选题 Pythons differ than most other snakes by having two well developed lungs rather than a much smaller left lung or no left lung at all.

【正确答案】 A

【答案解析】答案：A 分析：differ than应改为differ from，固定搭配，意思是“与…不同”。改正： differ than → differ from 翻译参考：蟒蛇和其它多数的蛇的最大区别在于它有两个进化很好的肺而不是左肺很小或者是根本没有肺。