单选题 G
Canada and the United States are two countries. They are on the same continent (大陆) next to each other and share (共有) the same language.
These two countries also share in other wags. Canada buys many things from the U.S. Cars and clothes are two examples. The Unite States also buys Canadian made things. Much of the paper used in the United States comes from Canada. Some of the oil we use comes from Canada, too.
Americans travel to Canada on holidays. And Canadians often visit the United States. Canadians read about the U.S. in newspapers and books. Americans watch Canadian sports played in the United States.
There are important differences between the two countries. They are about the same size. But the U.S. has many more people. Because the number of people is smaller, there is more open space in Canada. There is more unused land. This is another important difference.

单选题 The writer writes the text mainly to ______.

单选题 From the text, we know that Canada must be a country good at making ______.

单选题 According to the text, one main difference between the two countries is ______.

单选题 The words "open space" in paragraph 4 mean ______.

单选题 It is most likely that the writer of the text is a(n) ______.