单项选择题
A．keep after a flying target B．hit a flying saucer C．fire straight at a missle D．keep chasing the enemy's tanks
A．shoot its back B．get behind it C．move it to the side D．move out of its way
A．gain the skills of using your guns B．wipe out a score tanks C．hunt a number of enemy's saucers D．kill some supertanks or missiles