문제 내용: 다음 글의 내용과 일치하지 않는 것은?
선택지 1: Centered on the Hudson and James Bays is a giant core of rock, the Canadian Shield.
선택지 2: The Appalachian Mountains are North America's longest mountain range.
선택지 3: From Quebec to central Alabama, the Appalachian Mountains stretch.
선택지 4: The Piedmont is traversed by many rivers that flow toward the Plain.