单项选择题
A．people should cross the street quickly B．approaching vehicles must stop C．all vehicles must slow down D．police should be called in
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