Considerthefollowingexchange:DUNS:Ournei...tion.Inthisargument,

（）为美制粗牙统一螺纹。 A: AUNF B: BUNC C: CUNR D: DUNS

Consider the following exchange: DUNS: Our neighbors said that the new vegetarian restaurant serves delicious food. Our neighbors, however, are racists. So we should not pay any heed to their recommendation. In this argument,