题干

在美丽的鄂尔多斯草原上,羊、牛、马共同生活,享受着同样的牧草.它们吃了相同的食物,却长出了不同的羊肉、牛肉、马肉,其根本原因是(    )

A:它们的新陈代谢方式不同

B:它们的消化和吸收功能显著不同

C:它们的细胞大小形状不同

D:它们细胞中染色体上的基因不同

上一题 下一题 0.0难度 选择题 更新时间:2019-08-24 11:39:01

答案(点此获取答案解析)

D

同类题3

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Be an inventor

    The biggest secret about inventing is that anybody can do it! Perhaps this sounds crazy, but it's true. Maybe you have the wrong idea about inventing, so read on to discover the truth.

Wrong idea number 1:____

    Well, inventing means creating something “new”, but the idea could come from something that already exists.____ 

Wrong idea number 2: Inventors are born, not made.

    There are a lot of factors that make invention possible. Take Mozart, for example. He was born with a special talent for music.____His father was a music teacher, and Mozart practiced for hours every day, from the time he was in kindergarten.

    ____Very successful creators don't give up when they get something wrong. As one inventor said, “A failure is the right answer to the wrong question!”

    Wrong idea number 3: Inventors are always old people.

____ Here is an example of a young inventor: Louis Braille went blind when he was a child. When he was 15, he invented a system of reading and writing for blind people that is still used in most countries today.

A. Everyday things can give people lots of ideas.

B. An invention has to be something completely new.

C. But other factors were also important for his creativity.

D. As a young man, George Nissen invented the trampoline (蹦床).

E. Don't believe that you can't invent something when you are young.

F. Thomas Edison said that being an inventor was “99% hard work and 1% inspiration”!

G. The Wright brothers, for example, got the idea for building a “flying machine” from watching birds.