Sentence:  The car was just about to us , its driver 's fat , solemn face intent on the road ahead , on business , on a family in Sante Fe - on anything but an old pick-up truck in which two <WSD>human</WSD> beings desperately needed rescue . 
Meaning of the word marked with <WSD> tags:  any living or extinct member of the family Hominidae characterized by superior intelligence, articulate speech, and erect carriage