单选题(共35题,52.5分)-|||-7.(1.5分)下列化合物中,与HBr最容易发生亲电-|||-加成反应的是 ()-|||-A .(H)_(2)=C(H)_(2)-|||-B (H)_(2)CH=CHC(H)_(3)-|||-C .(H)_(3)CH=!=!= CHC(H)_(3)-|||-D (C(H)_(3)).C=CHC(H)_(3)