In the past few years，scientists have shown that bees have some surprising math skills.Now，new research shows that bees can even be trained to tell the difference between odd and even numbers（奇數(shù)和偶數(shù)）.（1）

E

E

   To train the bees，scientists in Australia hung up cards with an odd or even number of shapes（like triangles or circles）.The cards represented the number 1 through 10.Under each card was a small tray（盤） with a liquid.（2）

D

D

If it chose the wrong card，it got a sour liquid.
   The researchers trained one group of bees to choose odd numbers.（3）

C

C

They kept training the bees until they got it right 80%of the time.
   （4）

B

B

They had the bees choose between cards with 11 and 12 shapes on jye.aim.The bees had never seen these numbers in their training.Even so，they were able to correctly choose the odd or even number 70%of the time.
   The scientists still don't understand what methods the bees used to get the correct answer.
   （5）

A

A

One reason is that the scientists believe that studying bee brains might help us learn how to build better and faster computers.After all，a bee's brain is about 86，000 times smaller than a human brain.How does it do with such complicated（復(fù)雜的） ideas？

A.Why do the scientists do this research？ B.Then they added a new challenge. C.They trained another group to choose even numbers. D.If a bee flew to the right card，it would get sugar water. E.Before this，humans were the only animals known to have this ability.