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Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

Scientists know that there were wolves on Earth about one million years ago. Dogs, on the other hand, have not been on Earth nearly as long. The oldest dog remains, found in Germany, are about 14,000 years old. Scientists have proven that dogs are descended from wolves. Though wolves and dogs share some of the same genes, they are not exactly alike. In fact, there are as many differences as there are similarities between the two. 

First, there are physical differences between the two. Wolves have longer legs, larger feet, and a broader skull than dogs. They also walk differently from dogs. A wolf runs on its toes with its heels raised up from the ground. This is more similar to a cat's walk than a dogs. 

Second, there are mental differences between the two. Dogs have been domesticated. This means that dogs have been brought under the control of humans in order to provide companionship. Wolves have not been domesticated. They are wild animals. Having a dog as a pet is like having a juvenile wolf. A young wolf will turn into a mature adult, while a young dog does not mature. A dog might seem smart by performing tricks for people. Wolves need to be smart to survive in the wild. While it may not be impossible to have a wolf as a pet, scientists are of the opinion that a wolf could never be domesticated in the same way as a dog. 

It's important to keep in mind that the differences between the two are great, and each should be appreciated in its own habitat or home. 

(Source: Paul Edmunds, Nancie McKinnon, Developing skills for TOEFL IBT) 

19. The passage mainly discusses ......................

A. the differences and similarities between wolves and dogs

B. the great differences between the wolf and the dog 

C. the similarities between the wolf and the dog 

D. the way to distinguish between a wolf and a dog

20. The word “they” in paragraph 1 refers to 

A. wolves                   

B. dogs                       

C. scientists                    

D. both wolves and dogs

21. According to the passage, which of the following is NOT true about the dog?

A. Dogs provide human beings with companionship.

B. A dog might be smart enough to perform tricks.

C. A dog walks the same way as a young wolf does.

D. Dog shares some genes with those of wolves.

22. According to the passage, which of the following is NOT mentioned about the wolf?

A. Wolves have been living on Earth for about a million years.

B. Wolves have better genes than dogs, so they are stronger.

C. Wolves could not be domesticated the way dogs have been.

D. Wolves may not be kept as pets the way dogs have been.

23. The word “mature” in paragraph 3 almost means ......................

A. fully grown           

B. early rise                

C. full blossom   

D. completely evolve