A pet is an animal that (21) in your house. Over half the families in North America own pets. The most popular (22) are dogs, fish and birds. Rabbits, hamsters and turtles are also popular. Even some unpopular animals such as frogs, mice and snakes are pets.
People first (23) to keep pets about 12,000 years ago. The first pet was a dog. The dog did not become a pet because people (24) it was cute. It became a pet because it was useful. People used the dog for many things. The dog warned people (25) danger so wild animals didn’t attack people. It also ate left-over food. Later, dogs helped people take care (26) cows and sheep on farms.
Cats did not (27) pets for a long time. When the Egyptians first started to grow grain, mice ate it. The Egyptians were (28) to tame cats.
Today, people keep many (29) of pets. Animals such as canaries, parrots, mice and hamsters live in cages. They need peo
A. become
B. grow
C. turn
D. change
A pet is an animal that (21) in your house. Over half the families in North America own pets. The most popular (22) are dogs, fish and birds. Rabbits, hamsters and turtles are also popular. Even some unpopular animals such as frogs, mice and snakes are pets.
People first (23) to keep pets about 12,000 years ago. The first pet was a dog. The dog did not become a pet because people (24) it was cute. It became a pet because it was useful. People used the dog for many things. The dog warned people (25) danger so wild animals didn’t attack people. It also ate left-over food. Later, dogs helped people take care (26) cows and sheep on farms.
Cats did not (27) pets for a long time. When the Egyptians first started to grow grain, mice ate it. The Egyptians were (28) to tame cats.
Today, people keep many (29) of pets. Animals such as canaries, parrots, mice and hamsters live in cages. They need peo
A. many ways
B. in many ways
C. a better way
D. plenty of ways
People all over the world today are beginning to hear and learn more and more about the problem of pollution. Pollution is caused either by man’s release of completely new and often artificial (人造) substances into the environment, or by releasing greatly increased amounts of a natural substance (物质), such as oil from oil tankers into the sea.
Whatever its underlying reasons, there is no doubt that much of the pollution caused could be controlled if only companies, individuals and governments would make more efforts. In the home there is an obvious need to control litter and waste. Food comes wrapped up there or four times in packages that all have to be disposed of; drinks are increasingly sold in bottles or tins which cannot be reused. This not only causes a litter problem, but also is a great waste of resources, in terms of glass, metal and paper. Advertising has helped this process by persuading many of us not only to buy thing we neither want nor need, but al
A. air and water pollution
B. both a litter problem and a waste of resources
C. to pay for the service
D. to produce the receipt
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