1. which sentence from the text best summarizes a main idea of the article? a) people have more ways of marking time, and they do it more precisely. b) all living things must know the time to adjusto the world as it changes. c) ancient people spent most of their time outside. d) early calendars were based on the earth's orbit around the sun.
The average height of a wolf at the withers approx. 90 cm, length 120 cm without the tail, and the weight of 45 kg, although some individuals can weigh up to 90 kg. Shaggy coat, usually gray, but in the Arctic almost white. The ears are relatively small - this is the same adaptation to cold winters, as well as bushy tail, which during sleep in the snow beast covers bare soles of the feet and nose. Exhaled warm air, lingering among the long hair of the tail, warms the whole body.
It is believed that wolves are paired for life. The breeding season they have - ranyaya spring. Pregnancy lasts for about two months, puppies, covered with short blackish-brown fur, usually born in May. In the litter of six pups often, but it happens and 14. After 9 days, they open the big blue eyes that would soon fade. First limbs grow faster than the rest of the body, and the cubs look very leggy. In the age of three months they begin to learn hunting techniques. By 18 months of the wolf reaches its maximum size, but in the female sexual maturity comes only two years, and males - three. The family does not break up two years, even if the wolf gives birth again. Lair is usually arranged under the ground and may be a hole of up to 9 m.
Howling Wolf very peculiar - long, with modulations depending on the situation. Usually it is a hunting call, published in the twilight, when the beast is ready to harassment production. Large flocks of wolves do not hunt, usually only in family groups. American race shows the speed up to 40 km / h; Russian faster - up to 56 km / h. Wolf makes a jump of 4.8 m. The prey is almost every animal - from mice to deer, but the basis of the diet - rodents and lagomorphs. Earlier in America wolves followed the herds of bison, eating stragglers, sick and dead animals. Very voracious predator - at one time he eats up to 8 kg of meat, which he does not lack for a few days.
Sometimes Eskimos bred wolves with dogs to improve the breed - adding to her "wolf blood." Captive-bred wolves can become quite tame.
Harmful gases emitted by factories, cars and other equipment. These gases accumulate in the atmosphere and do not allow reflected by the surface of the Earth the sun the light to leave the atmosphere, which causes the warming. Because of global warming catastrophically quickly glaciers melt, the water level in the seas and oceans is growing rapidly and threatens imminent flooding of the entire island and coastal countries. Also is facing a huge number of icebergs in the oceans, which means greater danger to navigation. Which in turn can deliver a crushing blow to the economy of many countries, since most of the goods exported and imported by sea.
Warming also dangerous for wildlife, with many species of animals and plants adapted to low temperatures, and if it goes up, the plants that eat animals may die out and they will die animals that fed on them, and behind them - those who eat these animals, and so on.
I want to live in a country with a strong economy, a rich flora and fauna, cool climate!
Let us keep our planet together!
Say "No" to the pollution!
Let us turn to alternative sources of energy!
Restore forest!