A pet is an animal that【21】in your house. Over half the families in North America own pets. The most popular【22】axe dogs, fish and birds. Rabbits, hamsters and turtles are also popular.【23】some unpopular animals such as frogs, mice and snakes are pets.
People first【24】to keep pets about 12,000 years ago. The first pet was a dog. The dog【25】not become a pet because people【26】it was cute. It【27】a pet because it was useful. People used the dog for many things. The dog warned people【28】danger so wild animals didn't attack people. It also ate leftover food. Later, dogs helped people take care【29】cows and sheep on farms.
Cats did not【30】pets for a long time. When the Egyptians first【31】to grow grain, mice ate it. The Egyptians were【32】to tame cats.
Today, people keep many【33】of pets. Animals such as canaries, parrots, mice and hamsters live in cages. They need people to bring them food and water and to keep their cages clean. Other animals, such as dogs and cats, need food and water, but they【34】take care of themselves【35】. They are good pets for people because they don't need much care.
(36)
A．lives
B．stays
C．sleeps
D．plays
Hares and Rabbits One of the gentlest of all anima...
Hares and Rabbits One of the gentlest of all animals is the hare. When you consider how mild this animal is, you might wonder how it can survive in a world full of enemies. But then you've also probably noticed its strong hind（后面的）legs. Those legs give it plenty of speed. And you know how rapidly hares and rabbits breed（繁殖）. That’s another reason why they manage to survive. Hares and rabbits have long, sharp front teeth. Their hind legs are longer than their front legs so that they run faster uphill than downhill. When they are hunted, they use tricks such as taking huge leaps to break the smell or signal danger to each other by hitting the ground with their hind feet. Hares and rabbits are purely vegetarians（素食者）. They can live very well on the inner bark f trees. There are many differences between hares and rabbits. Hares are larger, and their feet and ears are longer. Hares do not dig holes or live in groups, as do rabbits. Hares are born pen-eyed and with thick fur, while rabbits are born blind and hairless. North America is the home of many different types of hares. One of the best known is the jack hare, a large hare with very long ears. Jacks are so fast that they can sometimes make a leap of six meters. The March hare, whom we know from Alice in Wonderland, is a common European hare. In March, they are always busy in mating, thus acquiring its name. Unlike hares, rabbits are social animals, living together in holes. A rabbit may mate when it is six months old and its young are born within a month. So if the rabbit has no natural enemies, it can become quite a pest. People are curious about the survival of the hare because_____.A.their legs are not strong enough
B.their growth is not fast enough
C.they are too gentle
D.they run too slow
Hares and rabbits use tricks when they_____.A.run uphill
B.are hunted
C.signal danger
D.take huge leaps
Rabbits' natural enemies prevent them from_____.A.becoming a big trouble
B.breeding when young
C.living in holes
D.becoming social animals
Compared with hares, rabbits_____.A.have longer feet
B.have thicker fur
C.are born pen-eyed
D.like to live in groups
Many people get to know the March hare from the fact that it_____.A.has long ears and legs
B.digs a lot of holes in March
C.can make a leap of six meters
D.appears in Alice in Wonderland
