单项选择题
A.The TV program ratings and reviews. B.The product’s color and size. C.The electronic links. D.The shopping carts.
A.65 miles per hour B.55 miles per hour C.Lower than 30 miles per hour D.Higher than 30 miles per hour
A.who have opened your messages B.how old your message readers are C.what quality your advertised product has D.how much your advertising messages cost