Sentence:  This <WSD>is</WSD> n't surprising when we consider that over 29 percent of the 11 - year old boys in America cannot chin themselves once , and that English school girls outdo them in almost every test ( even dashes and endurance ) . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)