不同形状的鸟蛋，有何奥妙？

                                                                                            

      Birds’ eggs have different shapes, such as round, oval and pointy. The scientists observed 50,000 eggs from 1,400 different bird species. They looked at the shape, length and height of the eggs. Scientists know why birds’ eggs are different shapes. 
People once said male birds came from rounder eggs. But that was wrong. Scientists say the shape makes birds fly better. Birds with the most-oval-shaped eggs were the best fliers. Hummingbirds have the most-oval-shaped eggs. Owls have the roundest eggs. And sea birds have the pointiest eggs.

  

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1.How many eggs did the scientists observe?

A 5,000 eggs.

B 50,000 eggs.

C 1,400 eggs.

D 14,000 eggs.

解析：选B。细节理解题。根据第一段第二句The scientists observed 50,000 eggs from 1,400 different bird species. 可知科学家们研究了50000颗蛋，故选B。

2.Did the scientists find why birds’ eggs are different shapes?

A Yes, they did.

B No, they didn’t.

C Yes, they are.

D No, they aren’t.

解析：选A。细节理解题。根据第一段最后一句Scientists know why birds’ eggs are different shapes. 可知科学家发现了为什么鸟类的蛋是不同的形状，故选A。

3.Which kind of shape makes birds fly best?

A Oval.

B Pointy.

C Round.

D All kinds of shapes.

解析：选A。细节理解题。根据第二段第三、四句 Scientists say the shape makes birds fly better. Birds with the most-oval-shaped eggs were the best fliers. 可知科学家说这种形状使鸟飞得更好，蛋的形状最接近椭圆形的鸟是最好的飞行员，故选A。

4.From the passage, we can NOT know that ____.

A birds like green eggs

B owls have the roundest eggs

C sea birds have the pointiest eggs

D hummingbirds have the most-oval-shaped eggs

解析：选A。细节理解题。根据第二段最后三句Hummingbirds have the most-oval-shaped eggs. Owls have the roundest eggs. And sea birds have the pointiest eggs.可知B、C、D三项正确，故选A。

5.You may see the article in ____.

A a novel

B a workbook

C a storybook

D a science book

解析：选D。文章出处题。根据全文内容可知，文章最可能来自科学书籍，故选D。