"Which color truck? Match each truck to the colors on the opposite page. Slide the doors to find the answers."
Bookworm's interest at 19 months: He loved this from the first read (and the second, third, fourth, fifth...). He could do the color ones right away, gets most of the close-ups right, needs help identifying the words signifying a matching vehicle, and is iffy on who drives what (though he will probably learn it quickly with the aid of the book).