问题 填空题

钢铁是非常重要的金属材料.请回答有关问题:

(1)工业上用一氧化碳和赤铁矿(主要成分是Fe2O3)炼铁的化学方程式为______.

(2)常温下,铁生锈的条件是铁接触空气中的______和______.

(3)多数食品易吸收空气中的水分而潮解,并吸收空气中的氧气而腐败.生产上多在食品中放一小包CaO粉末,保持干燥.现研究成功在食品中放一小包铁粉,铁粉吸收水分和氧气变为铁锈.用铁粉代替CaO粉末的优点是______.

答案

(1)高温条件下,一氧化碳与氧化铁反应生成铁和二氧化碳,反应的化学方程式为3CO+Fe2O3

 高温 
.
 
2Fe+3CO2

(2)铁在同时接触到水和氧气时才会被锈蚀,因此铁生锈的条件应是铁接触空气中的水和氧气;

(3)铁粉既可吸收水分防止食品潮解,又可吸收氧气防止食品腐败,而CaO只能吸收水分而防止食品潮解;

故答案为:(1)3CO+Fe2O3

 高温 
.
 
2Fe+3CO2

(2)水;氧气;

(3)CaO只能吸收水分不能吸收氧气,而铁粉既能吸收水分又能吸收氧气.

填空题
阅读理解

We’re always looking for well-written reviews of books, music, movies, television shows, websites, video games and other products. When writing a review, concentrate on exactly what you liked or didn’t like. Give examples of strengths and weaknesses, be descriptive and provide background information on an author, director, actor or musician, if possible. Find professional reviews in magazines or newspapers and see how reviewers deal with their topic, but be sure to express your own voice in your review.

Grammar Hint for Reviews: When describing a book, movie, album or anything else, use the present tense.

Book Reviews

Discuss an author’s technique, strengths and weaknesses instead of focusing on the plot. Does the story flow? Is there a strong sense of character and place? Did you stay up until dawn to finish it? Is it good reading for teenagers? What influence did it have on you and why? If you’ve read other books by the same author, discuss how this book compares.

Movie Reviews

Think of the major Oscar categories and consider the performances, music, lighting and setting, etc. Do these work together? Did some hold up while others didn’t? If the movie is based on a book, discuss whether one is better than the other and why. If the movie is a remake, compare the film to its original.

Remember that a well-written movie review should discuss strengths and weaknesses. Some readers may not have seen a movie yet, so don’t give away an exciting scene or the ending!

College Reviews

Begin by providing an overview of the college, including location, size and a description of the campus and/or dorm life. Think about all aspects of your college visit. What academic, athletic and after-class programs are available? What are the students like? What makes the college different from others? Every school has strengths and weaknesses. Be objective. Consider what the school has to offer and who might enjoy or benefit the most from attending there.  

小题1:When writing a review, you ________.

cannot refer to any previous review

must express your own views and opinions

must provide some information about the author

needn’t give any examples to support your views

小题2:Which aspects should be included in all three reviews?

A.Strengths and weaknesses.

B.Plot and character.

C.Programs and scenes.

D.Location and description.小题3: Where can you probably find the passage?

A.In a personal diary.

B.In an official report.

C.In a tourist guidebook.

D.In a popular magazine.