investigators concluded that human failure was not responsible for airplane crash last Augst,and since that time new and more stringent rules for identifying and reporting mechanical problem have beeb in effect.that accounts for the fact that reports of airplane mechanical problem have increased in frequency by 50 percent since last August which one of the following is an assumption buderlying the argument 1 airplane travel is still safe,despite the inceasing in the reproted mechanical problem 2mechanical problem have inceased dramatically since last Augest 3mechanical problem in airplane have not inceased by 50% since last Augest 4airline are less reluctant to report mechanical problem than they previously were 5mechanical problem have become easier to detect since last August 请高手指点哪个是对了,我没太搞懂逻辑关系 |