tpo2task6

4. Pakicetus is the oldest fossil whale yet to be found. 5. Fossils thought to be transitional forms between walking mammals and swimming whales were found. 6. Ambulocetus' hind legs were used for propulsion in the water 托福TPO2Part2 阅读答案 参考答案: 1、2 2、1 3、3 4、3 5、1 6...