单项选择题
A．a computer game B．an underwater game C．how to use modem weapons on your enemies D．an army training exercise
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
A．keep after a flying target B．hit a flying saucer C．fire straight at a missle D．keep chasing the enemy's tanks