先通读下面的短文，然后根据短文内容和所给首字母，在空格内填入一个适当的词，使短文意思完整。

In many countries, people t__________ 1.by car or by bike. They also get from place to place using p__________ 2.transport such as buses and trains. However, some people live in parts of the world where it is i__________ 3.to build roads.

It is difficult to w__________4.in snow but easy to ski over it. So in places like Alaska, people use skis. If they want to go faster, they get dogs to p__________ 5.them on sleds(雪橇). Riding a snowmobile(雪地摩托) is a more m__________ 6., but expensive way of getting around on snow.

In desert(沙漠) like the Sahara in North Africa, people s__________7.get around on camels. Camels survive w__________ 8.in the desert, not because they can s__________ 9.water in their bodies though! They can survive without water for two weeks and without f__________10.for up to a month. H__________ 11. can only go without water for about three to five days.

Today there are 6.4 billion people on the earth. By the year 2050 there may be 12.5 billion . There are a lot of people to feed. We need more  and more food.
One way to produce more food is growing stronger plants. For thousands of years, farmers have made plants better. Every season, they pick the best plants for the next season. It works very slowly. Since 1983, scientists have been able to change plants more quickly by changing their genetic（遗传的） material. Foods from plants grown in this way are called genetically modified(改变的) foods, or GM foods.
By changing the genetic material of a plant, it is possible to make new plants. They make plants which are strong against plant diseases. They can also help in our diseases; a kind of rice is being prepared , for example , which stops people becoming blind.
Rich countries produce GM foods because they are easy to grow and bring in more money. Poor countries are interested in them because they help produce more food.
GM plants are not natural. No one knows how good or bad they are,. Making GM foods is only one way of feeding people in 2050. There are strong feelings against them, because they are unnatural. They may feed people , then hurt them or their children later. But both rich and poor countries are interested in their use, and they are not going to go away. In 2050, we may think differently about them.
【小题1】GM foods are made by                 
A. farmers            B. workers      C. scientists          D plants
【小题2】What are the good things about GM foods  ?
A. They make plants strong against diseases.   B. They are unnatural.
C. They can help in human diseases.            D  Both A and  C.
【小题3】GM foods        .
A. are a quick way to produce food    B. grow in the wild 
C. are safe                           D are grown only in rich countries
【小题4】Why do some people not like GM foods?
A. They are not useful.       B. They are not helpful.
C. They are not natural.      D  They are not cheap.
【小题5】From the passage we know that      .

Scientists say there are seven kinds of food that people should eat every day. They are: (1) green and yellow vegetables of all kinds; (2) citrus(柑橘类)fruits and tomatoes; (3) potatoes and other fruits and vegetables; (4) meat of all kinds, fish and eggs; (5) milk and foods made of milk, like cheese and ice-cream; (6) bread or cereal(谷类), rice is also in this kind of foods; (7) butter, or something like butter, with fat(脂肪)。
People in different countries in the world eat different kinds of things. They also eat different kinds in a day. In some place people eat once or twice a day; in other countries, people eat three or four times a day. Scientists say that these differences are not important. It doesn’t matter if a person eats dinner at 4 o’clock in the afternoon or at eleven o’clock at night. The important thing is that every day a person must eat something from each of the seven kinds of food. The most important thing is that we must find some ways to help the hungry people and make the people have right kinds of food, make them strong and healthy
【小题1】It is important that people should _________.