A study showed that all living flowers were from a single flower. This kind of flower lived about 140 million years ago. To know the appearance of the first flower,the scientists recorded the features of some living flowers. These flowers are from 792 kinds of flowers. Then the team was able to infer the appearance of the ancestral flower.
      There is no living flower that looks exactly like the ancestral one. That is a kind of flower that existed at least 140 million years ago. It has had a long time to evolve into the different kinds of flowers that exist today.

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1.What can we know about the study?

A People liked flowers 140 million years ago.

B All living flowers were from a single flower.

C Different flowers existed 140 million years ago.

D Flowers were all over the world just 140 million years ago.

解析：选B。细节理解题。根据第一段第一、二句A study showed that all living flowers were from a single flower. This kind of flower lived about 140 million years ago.可知一项研究表明，地球上现存的所有花卉都起源于同一种花。这种花来自1.4亿年前。故选B。

2.Why did the scientists record the features of some living flowers?

A Because they wanted to know the appearance of the first flower.

B Because they wanted to write a book about this.

C Because they wanted to paint these flowers.

D Because they wanted to build a park.

解析：选A。细节理解题。根据第一段第三句To know the appearance of the first flower, the scientists recorded the features of some living flowers.可知为了重现世界上第一朵鲜花的外观，科学家记录了许多现存花卉的外形特征，故选A。

3.What’s the Chinese meaning of “infer”?

A 预测

B 进入

C 喜爱

D 生活

解析：选A。词义猜测题。根据第一段第五句，并结合上下文可知“infer”的意思应该为“推测”，故选A。

4.Are there any living flowers that look exactly like the ancestral flower?

A Yes, there is.

B No, there isn’t.

C Yes, there are.

D No, there aren’t.

解析：选D。细节理解题。根据第二段第一句There is no living flower that looks exactly like the ancestral one.可知现存的所有花朵都与它们的祖先不同，故选D。

5.From the passage, which of the following statements is TRUE?

A Flowers will die out 140 million years later.

B People didn’t like flowers 140 million years ago.

C People learned how to plant flowers 140 million years ago.

D The scientists recorded the features of 792 kinds of flowers.

解析：选D。细节理解题。根据全文可知A、B、C三项错误，D项在第一段第四句，故选D。