单项选择题
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
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