insert two dashes where needed. when cross - country skiers legs aching and lungs burning cross the finish…

insert two dashes where needed. when cross - country skiers legs aching and lungs burning cross the finish line of a race, they often collapse like rag dolls.

insert two dashes where needed. when cross - country skiers legs aching and lungs burning cross the finish line of a race, they often collapse like rag dolls.

Answer

Brief Explanations:

The phrase "legs aching and lungs burning" is an appositive - like element providing extra information about the skiers. Dashes are used to set it off.

Answer:

When cross - country skiers — legs aching and lungs burning — cross the finish line of a race, they often collapse like rag dolls.