试题与答案

对于毒作用带描述正确的是()。 A.半数致死量与急性阈剂量的比值为急性毒作用带 B.

题型:多项选择题

题目:

对于毒作用带描述正确的是()。

A.半数致死量与急性阈剂量的比值为急性毒作用带

B.急性阈剂量与慢性阈剂量的比值为慢性毒作用带

C.急性毒作用带的值越小,引起死亡的危险性越小

D.急性毒作用带的值越大,引起死亡的危险性越大

E.慢性毒作用带的值越大,引起慢性中毒的危险性越大

答案:

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参考答案:B解析:《环境保护法》第二十九条规定:“对造成环境严重污染的企业事业单位,限期治理。中央或者省、自治区、直辖市人民政府直接管辖的企业事业单位的限期治理,由省、自治区、直辖市人民政府决定。”...

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题型:阅读理解

Once there was a piano player in a bar (酒吧). 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 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 was tired of listening to the piano.

D.she enjoyed his singing小题2:Nat King Cole succeeded because ________.

A.the lady helped him a lot

B.he caught the chance(机会)

C.he continued to play in the bar

D.he played the piano well小题3:The words “sit on” in the passage probably mean “________”.

A.fail to realize

B.forget to use

C.try to develop

D.manage to show小题4:From the story we know if you have some talent, you should __________.

A.hide it and wait

B.ask others for help

C.pay no attention to it

D.work hard to improve yourself小题5:Which could be the best title(标题) for the passage?

A.Sing in the Bar

B.Achieve Success in Life

C.Never Lose Heart

D.Find Your Hidden(隐藏的) Talent

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