Os termos destacados, no parágrafo abaixo, referem-se respectivamente, à/aos:

A QUESTÃO REFERE-SE AO TEXTO.    

Os termos destacados, no parágrafo abaixo, referem-se respectivamente, à/aos:

The American space agency, NASA, is to make all its research available free of charge. It is a move which will delight science enthusiasts and aspiring astronauts. Normally such material is hidden behind a paywall, meaning that it is often out of reach for the lay enthusiast.