92 學年度學測英文 第 28 題

Up to about 250 million years ago the world had just one huge super-continent called Pangaea. Animals were able to move and intermix with 26. About 200 million years ago this super-continent broke up into two continents: Laurasia and Gondwana. About 60 million years ago Gondwana broke up into 27 later became South America, Africa, Antarctica, India and Australia. Since then Australia 28 from the rest of the world by vast oceans. The animals there no longer had 29 with animals from other parts of the world. They evolved separately. As a result, about 95% of Australia’s mammals and 94% of its frogs are found 30 else in the world. Australia has lots of very unusual animals.