Borders on the Land, In the Ocean, and in the Air

應英三乙 4a0c0133 鍾辰

1.      Today, countries have national borders. National borders are where one country ends and another country begins.

2.      Government officials at the borders check, that is, take a careful look at, everyone who enters.

3.      The first kind is a physical border. Physical borders between countries can be rivers or mountains.

4.      In many countries, there is a tax on things that enter the country. A tax is money that you must pay to the government.

5.      They were not physical features, such as rivers or mountains.