THE FIRST FIRE USED BY PEOPLE WAS PROBABLY OBTAINED _____________....

27. - DE THI THU HAY CHON LOC DE THI THU TANH CO D AN
DE THI THU HAY CHON LOC DE THI THU TANH CO D AN
27. The first fire used by people was probably obtained _____________. A. from the sun’s heat through glass B. by rubbing wood together C. from heat or fire caused by nature D. by striking iron against flint