问题 单项选择题 B1型题

亚硝酸盐中毒机理是()

A.使红细胞中正常的氧合血红蛋白氧化成高铁血红蛋白,从而丧失了血红蛋白的正常携氧功能

B.抑制细胞内许多酶的活性,抑制了组织细胞内的生物氧化过程,呼吸链终止,阻止组织对氧的吸收作用,导致组织缺氧症

C.硫胺素酶可使其体内的硫胺素大量分解,导致硫胺素缺乏症

D.硫葡萄糖苷在胃内水解,产生多种有毒降解物质,引起中毒症状

E.刺激胃肠黏膜,引起胃肠炎。与许多功能蛋白质和一些重要的酶结合,使它们失去活性

答案

参考答案:A

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     Danielle Steel, America's sweetheart, is one of the hardest working women in the book business.

Unlike other productive authors who write one book at a time, she can work on up to five.Her research

before writing takes at least three years.Once she has fully studied her subjects, ready to divided into a

book, she can spend twenty hours nonstop at her desk.

     Danielle Steel comes from New York and was sent to France for her education.After graduation,

she worked in the public relations and advertising industries.Later she started a job as a writer which she

was best fit for.Her achievements are unbelievable: 390 million copies of books in print, nearly fifty New

York Times bestselling novels, and a series of Max and Martha picture books for children to help them

deal with the reallife problem of death, new babies and new schools.Her 1998 book about the death of

her son was shot to the top of the New York Times bestselling list as soon as it came out.Twentyeight

of her books have been made into films.She is listed in the Guinness Books of World Records for one

of her books being the Times bestseller for 381 weeks straight.

     Not content with a big house, a loving family, and a view of the Golden Gate Bridge, Danielle Steel

considers her readers to be the most important resource and has kept in touch with them by email.While

she is often compared to the heroines (女主人公) of her own invention, her life is undoubtedly much

quieter.But if she does have anything in common with them, it is her strength of will and her inimitable

style.There is only one Danielle Steel.

1. Danielle Steel is different from other writers in that ________.

A. she can write several books at the same time

B. she often does some research before writing a book

C. she is one of the most popular American women writers

D. she can keep writing for quite a long time without a break

2. Children who have read "Max and Martha" picture books may know ________.

A. how to deal with affairs at school

B. what to do if Max and Martha die

C. what to do when new babies are born into their families

D. how to solve the difficult problems in their writing classes

3. One of Danielle Steel's achievements is that ________.

A. some TV plays were based on her books

B. her picture books attracted a lot of young men

C. one of her books became a bestseller in 1998

D. she wrote the Guinness Book of World Records

4. We can learn from the passage that Danielle Steel ________.

A. lives an exciting life

B. values her readers a lot

C. writes about quiet women

D. is pleased with her achievements

5. What does the underlined word "inimitable" mean?

A. hardworking  

B. attractive

C. strange  

D. unique

选择题