题目内容：

Now scientists have discovered that the dogs behave like their masters, too. Just like children, they use a “ look and learn” ways when they go about their tasks.

Scientists at Oxford universities designed an experiment to test if the dogs have the ability to copy humans’ actions by using a simple wooden box. 10 owners showed their dogs how to open the wooden box .Sometimes they use their heads to push it and sometimes they use their hands.

10 dogs were divided into two groups---Group1 and Group2. In the first part of the test, Group1 were rewarded with a piece of meat for copying their owner’s actions. Group2 were rewarded with food for not copying and using other ways. With each dog the experiment was repeated hundreds of times. Scientists recorded the time to see which group was first to get 85% right. They found that Group1finished the task much sooner than Group2.

In the second part of the test, all the dogs were only rewarded for copying the way that their owners used. Group1 reached the 85% mark more quickly than Group2.

So the scientists draw a conclusion: “Like humans, dogs can copy actions that they see. Dogs’ imitative（仿效的）behavior is shaped more by their interactions（互动）with humans than by evolution(进化).”

Scientists said，“A dog’s behavior is influenced much like that of a child; they look and learn similar behavior. We hope that owners understand the importance of their actions and use this knowledge to set good examples and therefore have a good effect on the behavior of their pets.”

1.The scientists believe dog’s imitative behavior mainly comes from______________.

A. proper rewards      B. domestication    

C. human-dog interactions   D. evolution

2.The best title may be “___________________”

A. Dogs can finish their tasks quickly.             B. Dogs are interesting animals.

C. Masters always set good examples.            D. Dogs behave like their masters.

3.From the experiment, we know __________________.

A. It took the two groups of dogs the same time to finish the required task.

B. The dogs that copied their masters finished the required task much sooner.

C. The dogs that were encouraged to copy their masters finished the task more slowly..

D. The dogs that were encouraged not to copy their masters finished the task more quickly..

4.According to the last paragraph, we can infer ______________.

A. a cruel man can raise a cruel dog

B. dogs can be influenced by anyone

C. dogs always behave positively

D. dogs are the best kind of pets