【单选题】Dogs have a very good ______ of smell and are often used to search for survivors in the earthquake.
【单选题】Dogs have a very good _____ of smell and are often used to search for survivors in an earthquake. [ ]
【单选题】Dogs have a very_____sense of smell.
【单选题】Dogs have a very _________sense of smell.
【单选题】Dogs have a very good ______ of smell and are often used to search for survivors in an earthquake.