题目内容：

Scientists have learned a lot about the kinds of food people need. They say that there are several kinds of food that people should eat every day. They are: (1) green and yellow vegetables of all kinds. (2) citrus(柑桔) fruits and tomatoes; (3) potatoes and other fruits and vegetables; (4) meat of all kinds, fish and eggs; (5) milk and foods made from milk; (6) bread or cereal(谷类), rice is also in this kind of food; (7) butter,  or something like butter.

People in different countries and different places of the world eat different kinds of things. Foods are cooked and eaten in many different kinds of ways. People in different countries eat at different times of the day. In some places people eat once or twice a day; in other countries people eat three or four times a day. Scientists say that none of the differences is really important. It doesn’t matter whether foods are eaten raw or cooked, canned or frozen. It doesn’t matter if a person eats dinner at 4 :00 in the afternoon or at eleven o’clock at night. The important thing is what you eat every day.

There are two problems, then, in feeding the large number of people on earth. The first is to find some ways to feed the world’s population so that no one is hungry. The second is to make sure that people everywhere have the right kinds of food to make them grow to be strong and healthy.

1.According to the scientists, which of the following groups of food is the healthiest for your lunch?

A. beef, pork, fish, milk    B. potatoes, carrots, rice, bread

C. chicken, apples, cereal, cabbages    D. oranges, bananas, fish, tomatoes

2.If there is Paragraph 4, what do you think is going to be talked about?

A. When people eat their lunch

B. Why people eat different kinds of food

C. How to cook food in different ways

D. What to do with the two problems

3.People in different countries and different places of the world _______.

A. eat food in different ways    B. cooks their food in the same way

C. has their meals at the same time    D. has the right kinds of food to eat