搜题请搜索小程序“爱下问搜题”
问题 单项选择题 A1型题

能使血红蛋白中的Fe2+氧化为Fe3+的化学性污染物是（）

A.亚硝胺

B.亚硝酸钠

C.多环芳烃

D.杂环胺

E.丙烯酰胺

答案

参考答案：B

解析：亚硝酸盐摄入过量会使血红蛋白中的Fe氧化为Fe，使正常血红蛋白转化为高铁血红蛋白，失去携氧能力导致组织缺氧。

阅读理解
King’s College Summer School
King’s College Summer School is an annual(每年的)training program for high school students at all levels who want to improve their English.Courses are given by the teachers of King’s College and other colleges in New York.Trips to museums and culture centers are also organized.This year’s summer school will be from July 25 to August 15.More information is as follows:
Application(申请)date
●Students in New York should send their applications before July 18,2007.
●Students of other cities should send their applications before July 16,2007.
●Foreign students should send their applications before July 10,2007.
Courses
●English LanguageSpoken English:22 hoursReading and Writing:10 hours
●American History:16 hours
●American Culture:16 hours
Steps
●A letter of self-introduction
●A letter of recommendation(推荐)
*The letters should be written in English with all the necessary information.
Cost
●Daily lessons:$200
●Sports and activities:$100
●Travels:$200
●Hotel service:$400
*You may choose to live with your friends or relatives in the same city.
Please write to: Thompson,Sanders1026 King’s StreetNew York,NY 10016,USAE-mail: KC-Summer-School@yahoo.com
小题1:You can most probably read the text in________.
A．a newspaperB．a travel guide
C．a textbookD．a telephone book
小题2:Which of the following is true about King’s College Summer School?
A．Only top students can take part in the program.
B．King’s College Summer School is run every other year.
C．Visits to museums and culture centers are part of the program.
D．Only the teachers of King’s College give courses.
小题3:If you are to live with your relatives in New York,you will have to pay the school ________.
A．$200B．$400
C．$500D．$900
小题4:What information can you get from the text?
A．The program will last two months.
B．You can write to Thompson only in English.
C．As a Chinese student,you can send your application on July 14,2007.
D．You can get in touch with the school by e-mail or by telephone.
查看答案
单项选择题

我厂混匀料的铁品位一般是（）左右.

A、57%

B、61%

C、64%
查看答案