Read the text and answer questions 10 to 13Whates are sea-living mammals. They therefore
breathe air but cannot survive on land. Some species are very large indeed and the blue whale, which can exceed 30 meter length, is the largest
animal which lives on earth. Superficially, the whale looks rather like a fish, but there are important difference in its external structure; its tail consists of a pair of broad, flat horizontal paddles (the tail of a
fish is vertical) and it has a single nostril on top of
its breadth, broad head. The skin is smooth and shiny and beneath it lies a layer of flat (blubber). This is up to 30 meter in thickness and serves to conserve heat and body fluids.

10. What is the text about?
A. Whales
B. Sea-living mammals
C. The description of mammals
D. The difference between whales and fish

11. The purpose of the text is
A. to describe whales in general
B. to entertain the readers
C. to amuse the readers
D. to promote whales

12. Whales are sea-living mammals. This sentence is a part called....
A. thesis
B. abstract
C. orientation
D. general classification

13. Which serves to conserve heat and body fluids?
A. head
B. skin
C. nostril
D. a layer of fat​