A. AMOUNT B. NUMBER C. NUMBERS D. AMOUNTSB. READ THE PASSAGE AND CH...

5. A. amount B. number C. numbers D. amounts

B. Read the passage and choose the best option to answer the question

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 lived on land very long time ago.

However, during its thousands 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 animal. 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.