In the following article, some sentences have been removed. For Questions 1-5, choose the most suitable one from the list A—G to fit into each of the numbered blank. There are two extra choices, which do not fit in any of the gaps.

　　If you flew in an airplane over the continent of Antarctica, you would look down on a great sheet of snow and ice. The snow and ice slopes gently from a central plateau around the South Pole toward the sea. Along the coasts of Antarctica, sharp mountains rise up from the snow. Huge masses of ice called glaciers slide between the mountain ridges toward the sea. At the sea's edge, tremendous icebergs break off the glacier and float away. They are often enormous in size.

　　1) Most of the land beneath the snow is a great land mass. A chain of smaller islands is nearby. The islands and the land mass are joined into one continent by a thick blanket of ice.

　　Antarctica has nine-tenths of all the world's ice. If all this ice melted, the level of the world's oceans would rise 250 feet. Most cities along the coast would be drowned. In New York Harbor, water would almost cover the Statue of Liberty's head. But the ice in Antarctica does not melt. The temperature stays well below freezing the year round in most places. Antarctica is the coldest place on Earth. 2)

　　Antarctica does not have much plant life. Only a few simple plants, such as mosses, lichens, and algae, can grow there. 3) But along the coasts of the continent there are many birds, fish, and animals.

　　Thousands of whales and millions of seals swim in Antarctic seas. Six kinds of seals are found. The fur seal, the smallest, has long been hunted for its silky fur. The tough-skinned elephant seal is the largest. It can weigh as much as four tons.

　　4)

　　A number of birds live in Antarctica, and fly over the water and ice. 5) Each year it migrates between the northernmost islands of the Arctic (the region around the North Pole) and the shores of Antarctica —a distance of about 11,000 miles.

　　[A]The temperature stays well below freezing the year round in most places. Antarctica is the coldest place on Earth. The temperature there has been known to drop to more than 100 degrees below zero.

　　[B]The Arctic tern has been called the long-distance champion of the world.

　　[C]Most of the world's whaling takes place in Antarctic waters. The blue whale is the largest animal that has ever lived. It may weigh as much as 150 tons and be 95 feet long. Smaller whales include the bottlenose, the humpback, the sperm, and the finback.

　　[D]They cannot fly, but they have flipper-like wings, which make them strong swimmers.

　　[E]Beneath the snow and ice of Antarctica lies land. Snow piles deeper and deeper on top of the land and hardens into ice. In some places, it is three miles deep.

　　[F]The climate is so harsh, and food so scarce, that people cannot settle in Antarctica.

　　[G]When the ice sheets pushed down from the north reaching as far south as the river, it does not encounter any mountains and hard rocks.