问题 问答题 简答题

简述植物吸收矿质元素有哪些特点。

答案

参考答案:

(1)植物根系吸收盐分与吸收水分之间不成比例。盐分和水分两者被植物吸收是相对的,既相关,又有相对独立性。

(2)植物从营养环境中吸收离子时,还具有选择性,即根部吸收的离子数量不与溶液中的离子浓度成比例。

(3)植物根系在任何单一盐分溶液中都会发生单盐毒害,在单盐溶液中,如再加入其他金属离子,则能消除单盐毒害即离子对抗。

阅读理解

Once there was a piano player in a bar. People came just to hear him play. But one night, a lady asked him to sing a song.

"I don't sing." said the man.

But the lady told the waiter, "I'm tired of listening to the piano. I want the player to sing!"

The waiter shouted across the room, " Hey, friend! If you want to get paid, sing a song!"

So he did. He had never sung in public before. Now he was singing for the very first time! Nobody had ever heard the song Mona Lisa sung so beautifully!

He had talent (天赋)he was sitting on! He may have lived the rest of his life as a no-name piano player in a no-name bar. But once he found, by accident, that he could sing well, he went on working hard and became one of the best-known singers in the US. His name was Nat King Cole.

You, too, have skills and abilities. You may not feel that your talent is great, but it may be better than you think. With hard work, most skills skills can be improved. Besides, you may have no success at all if you just sit on your talent.

小题1:The lady asked the player to sing a song because          .

A.she had paid him for this

B.she knew him very well

C.she wanted to have a change

D.she enjoyed his singsing小题2:Nat King Cole successed because          .

A.the lady helped him a lot

B.he caught the chance

C.he continued to play in the bar

D.he stopped playing the piano小题3:From the story we know if you have some talent, you should          .

A.hide it and wait

B.ask others or help

C.pay no attention to it

D.work hard to improve yourself小题4:Which could be the best title for the passage?

A.Sing in the Bar

B.Achieve Success in Life

C.Never Lose Heart

D.Find Your Hidden Talent

单项选择题