A2:1.Having similar social background. 2.Having the same race or same ethni background. 3.Having the same religion. A3:1.For instance,only 9.2 percent of Japanese marriages are now arranged. 2.In the U.S.,where there are many different races,only 3percent of all marriages are between blacks and whites.A2: 1. Having similar social background. 2. Having the same race or same ethnic background. 3. Having the same religion. A3: 1. For instance, only 9.2 percent of Japanese marriages are now arranged. 2. In the U.S., where there are many different races, only 3percent of all marriages are between blacks and whites