B
新素材科普知识 People and dogs have been living together for hundreds of years. When did dogs and people become friends? Where did dogs come from?
A group of scientists tried to answer these questions. They just finished a study about the history of dogs. In the study, they looked at the DNA of dogs all over the world and found that dogs, like humans, shared DNA with their family members. The scientists put together a big family tree for dogs. It went all the way back to the animal's beginning.
In this way, scientists learnt about the history of dogs. The first dogs lived in Asia. They were born about 33,000 years ago. At first, there were only about 6,400 of them. Their parents were wolves.
The new study answers many questions. It raises some too. For example, what caused wolves in Asia to become dogs all those years ago?
One idea is that their DNA slowly changed and the wolves became dogs in the end. As time goes by, dogs became "man's best friends". Or it could happen the other way around. It was possible that some wolves started living with people before they became dogs. Living with people led to many changes to these wolves. It changed their DNA, so their offspring(后代) became dogs. In other words, it was possible that wolves were our friends before they became dogs.
By studying DNA, scientists now have a much better understanding of the history of dogs.
(
A. By living with dogs.
B. By studying the DNA of dogs.
C. By studying all the animals.
D. By making friends with dogs.
(
A. They lived in Africa.
B. They were born 6,400 years ago.
C. Their parents were wolves.
D. There were about 33,000 dogs.
(
A. Wolves.
B. Dogs.
C. Ideas.
D. Questions.
(
A. However, there is still much to learn.
B. But we still know little about wolves' history.
C. Because we've learnt about dogs' friends.
D. So they can explain when dogs became our friends.
新素材科普知识 People and dogs have been living together for hundreds of years. When did dogs and people become friends? Where did dogs come from?
A group of scientists tried to answer these questions. They just finished a study about the history of dogs. In the study, they looked at the DNA of dogs all over the world and found that dogs, like humans, shared DNA with their family members. The scientists put together a big family tree for dogs. It went all the way back to the animal's beginning.
In this way, scientists learnt about the history of dogs. The first dogs lived in Asia. They were born about 33,000 years ago. At first, there were only about 6,400 of them. Their parents were wolves.
The new study answers many questions. It raises some too. For example, what caused wolves in Asia to become dogs all those years ago?
One idea is that their DNA slowly changed and the wolves became dogs in the end. As time goes by, dogs became "man's best friends". Or it could happen the other way around. It was possible that some wolves started living with people before they became dogs. Living with people led to many changes to these wolves. It changed their DNA, so their offspring(后代) became dogs. In other words, it was possible that wolves were our friends before they became dogs.
By studying DNA, scientists now have a much better understanding of the history of dogs.
However, there is still much to learn.
How exactly dogs came to be our friends is still unclear.(
B
)5. How did the scientists study the history of dogs?A. By living with dogs.
B. By studying the DNA of dogs.
C. By studying all the animals.
D. By making friends with dogs.
(
C
)6. Which of the following is TRUE about the first dogs?A. They lived in Africa.
B. They were born 6,400 years ago.
C. Their parents were wolves.
D. There were about 33,000 dogs.
(
D
)7. What does the underlined word "some" in Paragraph 4 refer to?A. Wolves.
B. Dogs.
C. Ideas.
D. Questions.
(
A
)8. 新考法句子回填 Which of the following can be put in ""?A. However, there is still much to learn.
B. But we still know little about wolves' history.
C. Because we've learnt about dogs' friends.
D. So they can explain when dogs became our friends.
答案：B
5. B
6. C
7. D 【解析】根据画线词后面的“For example, what caused wolves in Asia to become dogs all those years ago?”可知，此处指该项研究回答了很多问题，但是又引出了其他一些问题，则画线词在此处指“问题”。
8. A 【解析】根据语境可知，空处在文中表示转折，排除 C、D 两项；空前的“the history of dogs”与空后的“How exactly dogs came to be our friends”都是探讨狗的历史，则排除 B 项。
5. B
6. C
7. D 【解析】根据画线词后面的“For example, what caused wolves in Asia to become dogs all those years ago?”可知，此处指该项研究回答了很多问题，但是又引出了其他一些问题，则画线词在此处指“问题”。
8. A 【解析】根据语境可知，空处在文中表示转折，排除 C、D 两项；空前的“the history of dogs”与空后的“How exactly dogs came to be our friends”都是探讨狗的历史，则排除 B 项。
解析：
翻译:
### B
#### 科普知识
人和狗已经共同生活了数百年。狗和人什么时候成为朋友的？狗来自哪里？
一群科学家试图回答这些问题。他们刚刚完成了一项关于狗的历史的研究。在这项研究中，他们研究了世界各地狗的DNA，发现狗和人类一样，会与家庭成员共享DNA。科学家们为狗整理出了一棵庞大的家族树。这棵树可以一直追溯到这种动物的起源。
通过这种方式，科学家们了解了狗的历史。最早的狗生活在亚洲。它们大约在33000年前出现。最初，它们的数量只有大约6400只。它们的祖先就是狼。
这项新研究回答了许多问题。但它也提出了一些新问题。例如，那么多年前，亚洲的狼是如何变成狗的？
一种观点认为，它们的DNA发生了缓慢的变化，最终狼变成了狗。随着时间的推移，狗成了“人类最好的朋友”。或者，事情也可能是反过来的。有可能一些狼在变成狗之前就开始和人类生活在一起了。和人类生活在一起给这些狼带来了很多变化。这改变了它们的DNA，所以它们的后代变成了狗。换句话说，有可能狼在变成狗之前就是我们的朋友了。
通过研究DNA，科学家们现在对狗的历史有了更好的理解。然而，仍有很多东西有待研究。狗究竟是如何成为我们的朋友的，目前还不清楚。
（B）5. 科学家们是如何研究狗的历史的？
A. 通过和狗生活在一起。
B. 通过研究狗的DNA。
C. 通过研究所有的动物。
D. 通过和狗交朋友。
（C）6. 关于最早的狗，以下哪项是正确的？
A. 它们生活在非洲。
B. 它们在6400年前出现。
C. 它们的父母是狼。
D. 大约有33000只狗。
（D）7. 第4段中划线的单词“some”指的是什么？
A. 狼。
B. 狗。
C. 观点。
D. 问题。
（A）8. 以下哪项可以填入“______”中？
A. 然而，仍有很多东西有待研究。
B. 但我们对狼的历史仍然知之甚少。
C. 因为我们已经了解了狗的朋友。
D. 所以他们可以解释狗什么时候成为我们的朋友。
### B
#### 科普知识
人和狗已经共同生活了数百年。狗和人什么时候成为朋友的？狗来自哪里？
一群科学家试图回答这些问题。他们刚刚完成了一项关于狗的历史的研究。在这项研究中，他们研究了世界各地狗的DNA，发现狗和人类一样，会与家庭成员共享DNA。科学家们为狗整理出了一棵庞大的家族树。这棵树可以一直追溯到这种动物的起源。
通过这种方式，科学家们了解了狗的历史。最早的狗生活在亚洲。它们大约在33000年前出现。最初，它们的数量只有大约6400只。它们的祖先就是狼。
这项新研究回答了许多问题。但它也提出了一些新问题。例如，那么多年前，亚洲的狼是如何变成狗的？
一种观点认为，它们的DNA发生了缓慢的变化，最终狼变成了狗。随着时间的推移，狗成了“人类最好的朋友”。或者，事情也可能是反过来的。有可能一些狼在变成狗之前就开始和人类生活在一起了。和人类生活在一起给这些狼带来了很多变化。这改变了它们的DNA，所以它们的后代变成了狗。换句话说，有可能狼在变成狗之前就是我们的朋友了。
通过研究DNA，科学家们现在对狗的历史有了更好的理解。然而，仍有很多东西有待研究。狗究竟是如何成为我们的朋友的，目前还不清楚。
（B）5. 科学家们是如何研究狗的历史的？
A. 通过和狗生活在一起。
B. 通过研究狗的DNA。
C. 通过研究所有的动物。
D. 通过和狗交朋友。
（C）6. 关于最早的狗，以下哪项是正确的？
A. 它们生活在非洲。
B. 它们在6400年前出现。
C. 它们的父母是狼。
D. 大约有33000只狗。
（D）7. 第4段中划线的单词“some”指的是什么？
A. 狼。
B. 狗。
C. 观点。
D. 问题。
（A）8. 以下哪项可以填入“______”中？
A. 然而，仍有很多东西有待研究。
B. 但我们对狼的历史仍然知之甚少。
C. 因为我们已经了解了狗的朋友。
D. 所以他们可以解释狗什么时候成为我们的朋友。