12.(　　 ) 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.

11.(　　 ) GM foods are made by ________.

A. farmers　　 B. workers　 C. scientists　　 D. plants

10.(　　 　) Which of the following is true?

　　　 A. Hunger is the only problem in our world.

　　　 B. Water shortage is the only problem in our world.

　　 C. Scientists don’t want to spend money solving the water problem.

　　 D. Scientists have been working hard and have made much progress in solving water problem.

(C)

　　 Today there are 6 billion people on the earth. By the year 2050 there may be 12.5 billion. This is a lot of people to feed. We need more food.

　　 One way to produce more food is by 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 material (遗传物质). Foods from plants grown in this way are called genetically modified foods (转基因食品), 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 (准备), for example, which stops people from 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 very interested in their use, and they are not going to go away. In 2050 we may think differently about them.

9. What is the writer mainly talking about in this passage?

　　　　 A. The ways of getting fresh water.

　　　 B. How to use fresh water in our daily life.

　　　 C. All people in the world should save water.

D. Different ways of making water in different places.

7.(　　 ) From this passage we know fresh water ________.

　　　 A. only comes from the rain　　　 B. can be used in many ways

　　　 C. can be found in many factories　 D. is needed by more and more people

(　　 )8 The word shortage in this passage means ________.

　　　 A. being enough　 B. being short of　 C. being short for　　 D. being less

6.(　　 ) Where does the fresh water people need come from?

　　　 A. Sea water.　 B. Rivers and lakes.　 C. Underground.　 D. Both B and C.

5.(　　 ) Memory is ________ that we keep in our mind and carry about.

　　　　 A. the best diary　　　　　　 B. the best camera

　　　　 C. a great help　　　　　　　　　　 D. a beautiful picture

(B)

　　 The world is not only hungry, it will also be thirsty for water. About 97% of water on the earth is sea water, or salt water. Man can only drink or use the other 3%of the fresh water (淡水)which comes from rivers, lakes and underground. On the other hand, because the number of people in the world is becoming larger and larger, more and more fresh water is needed. So water shortage becomes a big problem.

　　 How can we work out this problem? Scientists have found some ways to turn salt water into fresh water. One important way is to boil (使达到沸点)sea water with high heat until vapor (蒸汽)rises, leaving the salt. In this way, a lot of fresh water can be made quickly.

　　 But heating is not the only way to get fresh water. Other ways are tried, for example, digging deep wells, keeping rain water and preventing rivers from being polluted.

　　 Which way is the best? To get the most fresh water for the least money is the best.

4.(　　 ) _______ can take photos of what can be seen, felt, heard, smelt and tasted.

　　　　 A. A camera　　　　　 B. Memory　 C. A diary　　　　　　 D. A man’s mind

3.(　　 ) The children who live abroad with their parents can learn two languages more easily because _________.

　　　 A. they are very clever　 B. they have good teachers

　　　 C. they have more chances to use these languages　 D. they have a better life

2.(　　 ) If you have a good ________, you’ll have less difficulty in learning something.

　　　　 A. teacher　　　　　　　 B. camera　　　　　　　 C. memory　　　　　　 D. family