Ingliz Tilidan Onlayn Attestatsiya Testlari 9

SMALL WHALES
Dolphins and porpoises, often called simply «small whales,» are mammals, not fish, and are thus warm-blooded, keeping their body temperature nearly constant
even when they are exposed to different environmental temperatures. The mothers provide milk for the young for a year or more. Like other whales, dolphins have lungs and breathe through a single nostril, called the blowhole, located on top of the head.
The blowhole is opened during their frequent trips to the surface to breathe. In contrast to some of the large whales, dolphins and porpoises have teeth, which they
use to seize their food, consisting primarily of marine fish. Certain species of marine dolphins are the best-known biologically because they survive well in captivity, which means they can be more carefully observed. The bottle-nosed dolphin has been the most intensively studied because of its adaptability to salt-water holding tanks. It is a major participant in acrobatic shows at oceanariums and is noted for its curiosity toward humans.

From the information given in the passage, we can infer that dolphins …….

SMALL WHALES
Dolphins and porpoises, often called simply «small whales,» are mammals, not fish, and are thus warm-blooded, keeping their body temperature nearly constant
even when they are exposed to different environmental temperatures. The mothers provide milk for the young for a year or more. Like other whales, dolphins have lungs and breathe through a single nostril, called the blowhole, located on top of the head.
The blowhole is opened during their frequent trips to the surface to breathe. In contrast to some of the large whales, dolphins and porpoises have teeth, which they
use to seize their food, consisting primarily of marine fish. Certain species of marine dolphins are the best-known biologically because they survive well in captivity, which means they can be more carefully observed. The bottle-nosed dolphin has been the most intensively studied because of its adaptability to salt-water holding tanks. It is a major participant in acrobatic shows at oceanariums and is noted for its curiosity toward humans.

One of the special characteristics of the bottle-nosed dolphin is that …….

SMALL WHALES
Dolphins and porpoises, often called simply «small whales,» are mammals, not fish, and are thus warm-blooded, keeping their body temperature nearly constant
even when they are exposed to different environmental temperatures. The mothers provide milk for the young for a year or more. Like other whales, dolphins have lungs and breathe through a single nostril, called the blowhole, located on top of the head.
The blowhole is opened during their frequent trips to the surface to breathe. In contrast to some of the large whales, dolphins and porpoises have teeth, which they
use to seize their food, consisting primarily of marine fish. Certain species of marine dolphins are the best-known biologically because they survive well in captivity, which means they can be more carefully observed. The bottle-nosed dolphin has been the most intensively studied because of its adaptability to salt-water holding tanks. It is a major participant in acrobatic shows at oceanariums and is noted for its curiosity toward humans.

One of the differences between some whales and dolphins is that …..

SWIMMING BIRDS OF THE ANTARCTIC

Penguin ancestors could fly as well as any other sea bird. Now its wings are short, paddle-like flippers that are entirely useless for flight. The bird has lived for
ages in or near the Antarctic regions, where it has few enemies. Thus it came to spend all of its time on land or in the water. For generations it did not fly. In the
course of evolution, its wings became small and stiff and lost their long feathers. The penguins, however, became master swimmers and divers. Of all birds, they are the most fully adapted to water. Their thick coat of feathers provides a smooth surface that is impenetrable to water. Their streamlined bodies glide through the water easily.
The birds use their wings as swimmers use their arms in a crawl stroke, and they steer with their feet. Penguins can swim at speeds of more than 25 miles per hour.
When they want to leave the water, they can leap as much as 6 feet from the water’s surface onto a rock or iceberg.

The birds from which penguins are descended ……

A: «Are you going to the theatre tomorrow?»

B: “No, but I wish I _____.”

SWIMMING BIRDS OF THE ANTARCTIC

Penguin ancestors could fly as well as any other sea bird. Now its wings are short, paddle-like flippers that are entirely useless for flight. The bird has lived for
ages in or near the Antarctic regions, where it has few enemies. Thus it came to spend all of its time on land or in the water. For generations it did not fly. In the
course of evolution, its wings became small and stiff and lost their long feathers. The penguins, however, became master swimmers and divers. Of all birds, they are the most fully adapted to water. Their thick coat of feathers provides a smooth surface that is impenetrable to water. Their streamlined bodies glide through the water easily.
The birds use their wings as swimmers use their arms in a crawl stroke, and they steer with their feet. Penguins can swim at speeds of more than 25 miles per hour.
When they want to leave the water, they can leap as much as 6 feet from the water’s surface onto a rock or iceberg.

Penguins are especially well-suited to water because they ……

SWIMMING BIRDS OF THE ANTARCTIC

Penguin ancestors could fly as well as any other sea bird. Now its wings are short, paddle-like flippers that are entirely useless for flight. The bird has lived for
ages in or near the Antarctic regions, where it has few enemies. Thus it came to spend all of its time on land or in the water. For generations it did not fly. In the
course of evolution, its wings became small and stiff and lost their long feathers. The penguins, however, became master swimmers and divers. Of all birds, they are the most fully adapted to water. Their thick coat of feathers provides a smooth surface that is impenetrable to water. Their streamlined bodies glide through the water easily.
The birds use their wings as swimmers use their arms in a crawl stroke, and they steer with their feet. Penguins can swim at speeds of more than 25 miles per hour.
When they want to leave the water, they can leap as much as 6 feet from the water’s surface onto a rock or iceberg.

When penguins desire to get out of the water, ………