单选题 （）extend from the northern tip of Maine southwestern to Alabama.

单选题 What Midwestern city is the automobile capital of the world?()

单选题 The climate of the United States is influenced by().

单选题 New England lies in () of the United States.

单选题 What is the leading commercial crop of the south?()

单选题 The southern part of the Pacific coast in California has a () climate.

单选题 One of the most important lakes in the United States is(), which is the largest fresh water lake in the world.

单选题 The United States of America is the （）country in the world in size.