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    　　By the year 2050 there may be 12.5 billion people on the earth. We need to produce more food. One way to produce more food is by growing stronger plants. For thousands of years, farmers pick the best plants for next season to make plants better. It works 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's possible to make new plants. The new plants are strong against plant diseases（疾病）and help in our diseases. For example, a kind of rice can stop 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.

    　　Making GM foods is only one way of feeding people in 2050. Maybe we'll find better ways in the future.

    (1) ________ make GM foods.

    [　　]

    A．Farmers

    B．Scientists

    C．Workers

    D．Plants

    (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.

    (3) GM foods ________.

    [　　]

    A．are grown only in rich countries

    B．are grown only in poor countries

    C．are dangerous

    D．are a quick way to produce food

    答案：B;D;D
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