Question

3.        ，dogs are usually trained for hunting in the forest across the world. (nose )

因对气味嗅觉灵敏，狗在世界上通常被训练为猎犬。

Answer 1

 .Having a sharp nose for smells / As they have a sharp nose for smells考查分词结构和nose的用法。have a nose for对……有嗅觉，很善于发现。"因对气味嗅觉灵敏"在句中是原因状语，所以可用状语从句；又因该从句的主语与主句主语一致，可用现在分词短语作状语。