阅读下列短文，从每题所给的四个选项A、B、C和D中，选出最佳选项。
     It seems school children all over the world complain about  their school food. Cherie Blair, the wife
of  Prime Minister TonyBlair, said that she would prepare a packed lunch for her son if school dinners
do not improve. So what do students of your age eat for lunch at school?
     Japan
     High schools have canteens, which serve everything from noodles to rice, but not burgers and
chips.Other children bringfood from home such as cold rice balls, meat or fish, pickles and
vegetables                                                         
     The United States                                              
     A typical menu from a US school is made up of a hamburger with fried potatoes orroast chicken,
lettuce and pickles,fruit and cookies. School lunches must also provide at least one-third of the daily
dietary allowances (定量) of protein, vitamin A, vitamin C, iron, calcium, and calories (卡路里).
     Australia
     Meat pies, sausage rolls and hotdogs are all traditional dishes in Australian school shops. But as the
nation pays more attention to children's health, healthier foods have started to find their way onto school
menus.
     Many schools have used a traffic light system. The sale of red-1abelled foods,including pastries,
chocolate and soft drinks,is served only twice a week. Healthier green-labelled foods such as sushi,
sandwiches, corn and watemelon,however. Are served every day.
     In some schools. students have a choice of up to 89 foods to choose from, including popcorn and
rice.
     South Africa
     Most of South Africa's schools do not serve meals at all. Classes end at 1:30 pm and students. get
their own lunches. Many students bring food from home, usually  sandwiches.
     Fast flood and fried food sell the best among students, which has led to a rise in  obesity  among
children. But as more people began to realize the fact that being too fat  may cause different diseases,
some schools in towns have led the way towards better  nutrition. Now students at these schools are
provided with lunches of porridge with vegetables, such as cabbages, onions, beans, carrots and
tomatoes.
1. What does the underlined word "obesity" in the last paragraph probably mean?
A. Allowances.
B. Sadness. 
C. Nutrition.
D. Overweight.
2. We can infer from the passage that                      .
A. a typical menu from a US school is made up of enough nutrition
B. most students in South Africa eat their lunches at home
C. many schools in Australia have traffic lights outside their schools
D. you can have whatever you like in school canteens in Japan
3. What is the main idea of the passage?
A. Food served in the US is the best of all.
B. Schools should try to satisfy the needs of students．
C. Schools serve different foods from country to country.
D. School children all over the world dislike their school food.
4. Who is the article meant for?
A. School lunch suppliers.  
B. Headmasters.
C. Students.              
D. Nutritionists.