The grizzly bear

Appearance flesh nature reputation temper avid cautious frosted terrifying classed destroyed observed

The grizzly bear is one of the largest North American brown bears. In the Rocky Mountains, (1) ___ long hairs on the shoulders give this brown bear a “grizzled” (2) ___, and thus the name grizzly bear. Though (3) ___ with the carnivores, the grizzly bear is largely vegetarian and rarely eats (4) ___. During the summer these bears are (5) ___ fishers, and comb the waters of mountain streams and rivers to catch salmon swimming upstream.

Even though the name refers to the bear’s appearance rather than to its (6) ___, it can be an imposing and even (7) ___ beast. Tragic confrontations between people and the grizzly have led to its (8) ___ as an animal to be feared and even (9) ___. The grizzly plays a big role in the legends of the North American pioneers, and today visitors to national parks must be (10) ___ when they enter the grizzly’s habitat. The grizzly bear is an animal best (11) ___ from afar; cohabitation with man is not in its (12) ___.

11. Образуйте соответствующее однокоренное слово.

Spiders

S piders are considered to be disgusting and dead (1) to humans. But it is not the case. On the contrary, some of them have the repute (2) of “a shy and retiring spider that does not go looking for trouble”. Besides, the net they produce can be amazingly elaborate and comparable (3) to human building act (4) in the way they erect a form of the three-dimensional cartwheel pattern.

Of the 30,000 spider species, some 6,000 are orb spinners. Orb spinners are solitude (5) creatures who dwell one to a web. The web is home, food source, and mating ground, and it is guarded aggression (6). When a male arrives at mating time, the court (7) ritual is an intricate set of advances and retreats until the female is finally worn out and no longer tries to kill her would-be lover.

Orb spinners each weave a new web every day, working in the predawn dark (8) and executing the distinct (9) pattern of concentric circles and radius (10) lines in a half hour or less. There is nothing as important as web building, because without the web there is no food.

Only several spiders can be regarded as poison (11) and thus extremely dangerous, the black widow and the brown recluse being among them. The black widow’s bite is excruciatingly pain (12) and sometimes even morphine won’t knock out the pain.

But at least a black widow’s bite can be treated while there is no effective treat (13) for a brown recluse’s bite. These spiders are far more to be feared than tarantulas who are sometimes kept by risk (14) people as pets.

12. Образуйте соответствующее однокоренное слово.

Crocodiles, blood and carbon dioxide

C rocodiles kill their prey by diving under water once their prey is firmly between their power (1) jaws. Crocodiles can survive under water much longer than their prey, which dies from drown (2) long before the crocodile needs to surface for air. The secret of crocodile’s able (3) to stay under the water, whilst its prey drowns, lies in differ (4) in its haemoglobulin, resulting in the release of more oxygen that able (5) the crocodile to survive. Meanwhile, the prey’s haemoglobulin is capable (6) of similar respond (7), so the prey dies.

The genetic coding responsible for the behavior of both crocodile haemoglobulin and that of certain fish has now been identity (8) and introduced into the bacterium used to make art (9) human haemoglobulin. Man-made haemoglobulin which behaves like that of crocodile or fish might allow humans to stay longer periods under water. Such haemoglobulin could be use (10) to divers. More importance (11), it might be useful to those people with diseases which cause respiration (12) difficulties.

13. Заполните пропуски подходящими по смыслу словами из предложенного списка.