Use of English · Partie 3
After decades of relative stagnation, human (0) EXPLORATION (EXPLORE) of space is entering what many engineers consider its most consequential phase yet. Advances in reusable rocket (1) .......... (PROPEL) have dramatically reduced the cost per kilogram of payload delivered to orbit, and scientists are now seriously…
Débloque tous les examens, des simulations illimitées, les 80 étapes du jeu et plus encore.