单项选择题
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．let them shoot over you without any danger B．be certain of hitting your target(靶子) C．easily shoot from behind them D．fire straight at your enemy
A．a computer game B．an underwater game C．how to use modem weapons on your enemies D．an army training exercise