A

第二段提到“Then it is filled with air.The?pressure inside the plane is greater than it ever will be when?it is high up in the air．Finally，there is all explosion．”可判断，通过充气加压使飞机爆炸来检测出飞机的薄弱部分，这是tank test的目的，A项表明了tank test的结果，符合题意。B项“It will be made stronger．”是测试之后所要做的事，题干中的under the“tank test”是指在测试进行当中，因此不可选B项。