r unsubstituted monovalent hydrocarbon group free of an aliphatic unsaturated bond or an alkoxy group; R2, which is identical or different, is an aliphatic unsaturated group selected from an alkenyl group and an oxygen atom-containing aliphatic unsaturated group; and letters c and d are positive numbers satisfying 1.90???c<2.40, 0.0003???d???0.10, and 1.90<c+d???2.40, the organopolysiloxane contai