9．After putting your hand in the cold water，you put it in the hot water．You will find            

    A．the water too hot for you to bear．

    B．the hot water feels lukewarm．

    C．the water feels cold．

    D．your hand turns black．

8．Your left hand feels warm and your right hand feels cold because               ．

    A．they are in the same basin of water．

    B．Your fight hand is stronger than your left hand．

    C．your left hand is stronger than your right hand．

    D．they Were in different basins of water a short time ago．

7．How many basins are needed in the experiment?

    A．One．                 B．Two．                 C．Three．                  D．Four．

6．The writer is talking about                    ．

    A．hot water                                                B．cold water

    C．basins                                                       D．an experiment（试验）

5．From the reading we know that                    ．

    A．GM foods will disappear one day in the future．

    B．GM foods will not disappear in the future．

    C．People will not be interested in GM foods．

    D．People will have to stop using GM foods．

（B）

    Take three basins（盆）．Fill the first basin with water which is as hot as you are able to bear（承受）with your hands．In the second basin mix hot water with cold water．Fill the third basin with cold water from the tap（自来水管）．Now place the basins on the table．Put your fight hand in the hot water．Put your left hand in the cold water．You will find that your fight hand feels hot and your left hand feels cold．After twenty seconds move both your hands into the lukewarm（微温的）water．What do you feel? Your left hand feels warm and your fight hand feels cold．But both hands are in the same basin of water．

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

3．GM foods                ．

    A．are a quick way to produce food                 B．grow in the wild（野生）

    C．are safe                                                     D．are grown only in rich countries

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．

    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．

l．GM foods are made by                   ．

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

    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 l 983，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．