If you go to a fast food restaurant, you will probably see a lot of teenagers. Today, many teenagers are overweight, and the reason of this is because of their bad eating habits. Most teenagers love fast food with a lot of fat, oil, salt and sugar. People often call this kind of food “junk food”.

But bad eating habits go beyond fast food. We find many teenagers eat unhealthily. Some don’t have breakfast before they go to school. During the day, some don’t have a proper meal for lunch. In a recent survey(调查) at one school, scientists found that over two thirds of the students didn’t follow a healthy diet. They didn’t like vegetables, and many of them didn’t like to eat fruits. They preferred(更喜欢) to eat food with a lot of salt, sugar, or fat.

Parents today also worry about their children’s diet. Some doctors give the following advice:

Teenagers shouldn’t eat too much junk food.

Teenagers shouldn’t eat food with too much salt. Salt can cause high blood pressure(高血压)in the future.

Teenagers should eat food with less fat, oil, and sugar.

Teenagers need to eat some fruits and vegetables every day. Fruits and vegetables are rich in vitamins(维生素)and have little fat.

Teenagers need to drink more milk. Milk will help their bones grow.

Teenagers need to eat breakfast every day. This is good for their body and mind.

1.“Junk food” contains(包括)a lot of _____.

A. milk and sugar B. fruits and sugar

C. vegetables and salt D. fat, oil, salt and sugar

2.In a recent survey at one school, scientists found many students liked _____.

A. vegetables B. fruits C. healthy food D. unhealthy food

3.In this passage doctors think that teenagers should eat more _____.

A. food with no vitamins B. fat and sugar

C. vegetables and fruits D. salt and oil

4. The best title for this passage is _____.

A. Bad Habits B. Junk Food

C. Unhealthy Food D. Advice on Healthy eating

9.This dictionary tells you about English words and how to use them in reading,writing and speaking English.It gives the meaning of words,and it can help you with spelling,word building,grammar and pronunciation as well.
To use your dictionary correctly,you need to understand how the dictionary works.At the front of the book,you will find some exercises to help you make the most use of your dictionary.If you look up the word"centre",you will find two spellings for this word."Centre"is used in British English,while"center"is used in American English.When there are differences between British and American spelling,the dictionary shows it with the word"BrE"for British English and"AmE"for American English.
The dictionary also helps you pronounce words correctly.If you turn to the inside back face,you will see all the phonetic letters(音标) with some words to show you how they are pronounced.Just have a look at this page when you're not sure how to say a word.
The most important reason for using a dictionary is to find out the meaning of a word-its definition.In this dictionary,the definitions have been written using only 2000words.This means that the definitions of even the most difficult words are simple and easy to understand.

25.According to the passage,"theater"is used inC English.
A.Australian       
B.Canadian    
C.American    
D.British
26.Which of the following is TRUE according to the passage?B
A.All of the words in the dictionary have two spellings.
B.You can turn to the inside back face if you are not sure about the pronunciation.
C.There are two thousand words in this dictionary.
D.The dictionary can help you with listening,speaking,reading and writing.
27.The dictionary explainsD.
A.some of the difficult words          
B.the words of two meanings
C.all the easy words                        
D.all the words in a simple way.

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