1. In China,how long is a lunch break?
About one and a half hours.
2. Where do Japanese middle school students have lunch?
In their classrooms.
3. What are necessary on the menu in British schools?
Vegetables and fruit.
4. In which country students can have lunch outside the school?
China.
5. What is the passage about?
Different countries' students' lunch.
答案：【解析】：本题主要考查阅读理解和信息提取能力。题目给出了关于中国、美国、日本和英国学生午餐情况的短文，并要求回答相关问题。我们需要先阅读短文，然后根据短文内容，提取相关信息来回答每个问题。
1. 第一题问的是中国的午餐休息时间有多长，根据短文中的“Students usually have a lunch break(间歇)for about one and a half hours.”可以得出答案。
2. 第二题问的是日本中学生在哪里吃午饭，根据短文中的“In Japan,middle school students all eat together in their classrooms.”可以得出答案。
3. 第三题问的是英国学校菜单上必不可少的是什么，根据短文中的“Vegetables and fruit are necessary(必要)on the menu.”可以得出答案。
4. 第四题问的是哪个国家的学生可以在校外吃午饭，根据短文中的描述，只有中国提到了“Others like buying their lunch outside the school or going home to eat with their families.”，因此可以得出答案。
5. 第五题问的是这篇文章的主题是什么，通过阅读全文可以得知，文章主要介绍了不同国家学生的午餐情况。
【答案】：
1. About one and a half hours.
2. In their classrooms.
3. Vegetables and fruit.
4. China.
5. Different countries' students' lunch.
