Đề thi giữa kỳ 2 môn Tiếng Anh lớp 10 THPT Lý Thái Tổ, Bắc Ninh năm 2015

The whale is the largest mammal in the world. Since the whale is shaped like a fish, why is it still considered a mammal? The fact is that the whale did live on land a very long time ago. However, during its thousand of years of living in water, the whale gradually become structured like a fish. Thus, the whale has adapted to marine life. Nevertheless, though the whale resembles the fish externally, it still has the characteristics of a mammal. One important difference between the whale and a fish is that the baby whale is born alive. It is not hatched from an egg. Furthermore, the baby whale is fed on its mother’s milk just like other mammals. Unlike other sea creatures, the whale is a warm blooded animals. It keeps itself warm in the cold water with a layer of “blubber”. “Blubber” is a layer of oily tissue that protects the internal organs and retains heat.