Зоология на английском. Обязательный материал для чтения на занятиях и дома. Сологуб Л.И. - 26 стр.

UptoLike

ВУЗ: 

СГАУ | Самара

Составители: 

Рубрика: 

IV. Suggest the English for:
гораздо уже; широко использоваться; обращать внимание на...; что
характерно для всех пресмыкающихся; хотя путешествовать по суше;
следовательно; огромная сила; обеспечивать защиту; гниющая
растительность.
V. Ask your friend to answer your questions on the text. Begin your questions
with: I'm interested to know..., I want to know..., I'd like to know ...
VI. Make use of the text and prove that a crocodile and an alligator are not one
and the same animal.
VII. Sum up the text information, making its model.
Text 16
I. Read the text and say what information it carries.
SNAKES AND LIZARDS - ORDER SQUAMATA
In many respects snakes are the most interesting members of the entire
animal kingdom. Among their amazing characteristics is their ability to swallow
objects several times larger than their own diameter. This ability is due to the
loose construction of the head and to the act that' the various parts of the jaws
can be moved independently. The teeth, which curve toward the rear, help in
holding the prey and pulling it down the throat. During swallowing, the bones of
the head are greatly separated, and the jaws work independently forward and
back, gradually drawing the food down the esofagus and into the stomach.
Most snakes lay eggs; but a few species, including rattle-snakes
copperheads, and water moccasins, are ovoviviparous. One of the oldest and
most widely believed snake stories is that the females swallow their young to
protect them. Many snakes do eat the young of other snakes, but they do so to
satisfy hunger.
Venomous snakes had an excellent hypodermic apparatus long before we
thought of one. There are several kinds of venomous serpents, but the poison
glands and the mechanism for injecting the venom are similar in all of them. The
poison glands correspond to salivary glands and are located at the angle of the
jaw, one on each side. From each gland a duct leads forward and opens into a
hollow or grooved fang in the upper jaw. When a snake bites, the two long fangs
penetrate the victim's flesh, and both jaws close immediately. The muscles that
close the jaws also compress the poison glands, whereupon venom squirts from
the glands and passes down the duct through the fangs and into the victim.
25

Страницы