DNA（Deoxyribonucleic acid）is one of the most important discoveries in science. DNA is the plan for the human being ，as a blueprint is the plan for building. DNA makes a person look the way he does. A person’s DNA. comes from a mixing of his parents’ DNA . That’s why a child looks like his parents. But ，besides controlling things such as height and hair color，DNA can also give people diseases，Scientists are now studying DNA to cure diseases.

In the seventies, scientists developed a process called recombinant (重新組合) or RDNA. Although it sounds difficult to understand，RDNA simply means taking DNA from one animal or plant and putting it into another. By doing so ， scientists can create new beings. In so doing，scientists can better understand DNA，especially what parts of DNA do what parts of DNA do what. After they understand DNA，scientists can begin to cure diseases. Often，the new being created will itself be the cure.

Besides curing diseases，RDNA research can also do other things. For example，scientists in Japan have already created“super-trees”Trees help humans，because they take CO2， which poisons humans ，from the air and turns it into oxygen， which lets humans breathe.“Super-trees” do this too，but do it much faster. As things such as cars and factories have already put much CO2 in the area，“super-trees”are badly needed.

Unfortunately，there is serious danger in RDNA research.  Scientists want to create animals to cure old diseases，but these new animals may also create new diseases. It will be a serious problem if the animals escape from the science laboratory and into nature. As these animals are not natural，they may  let loose  many new powerful diseases.

      As a result，RDNA research will create many solutions （解決方案），but it will also create many problems.

1．From the passage，we can know that a boy looks like his parents because       

      A．he is son of his parents

      B．his parents’ DNA decides his appearance

      C．he has received DNA from his father or his mother

      D．scientists have put some of his parents’ DNA into him

2．What does the underlined expression “l(fā)et loose”probably mean？

       A．let．．．go free      B．get rid of            C．a(chǎn)bsorb                D．survive

3．What is the best title for the passage？

       A．The DAN Research in Japan

       B．A New Way of DNA Research in Japan

    C．The Causes and Effects of DNA Research

       D．The Advantages And Disadvantages of RDNA

4．The following statements are true abort RDNA research EXCEPT      

       A．the research has been stopped because the created animals carry virus

       B．super-trees might be widely planted around the world

       C．scientists have not completely understood DNA

       D．RDNA research will benefit human beings a lot

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       c．From 2006 to 2007 the number of Flight problem complaints increased by more than 2 percent.

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How Room Designs Affect Our Work and Feeling

Architects have long had the feeling that the place we live in can affect our thoughts, feelings and behaviors. But now scientists are giving this feeling an empirical（經(jīng)驗(yàn)的，實(shí)證的）basis. They are discovering how to design spaces that promote creativity, keep people focused, and lead to relaxation.

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A．Light       B．Ceilings.       C．Windows.       D．Furniture

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    A．the shape of furniture may affect people’s feelings

    B．lower ceilings may help improve students’ creativity

    C．children in a dim classroom may improve their grades

    D．students in rooms with unblocked views may feel relaxed

3．The underlined sentence in the last paragraph probably mean that_______.

    A．the problem is not approached step by step

    B．the researches so far have faults in themselves

    C．the problem is too difficult for researchers to detect

    D．research in this area is not enough to make generalized patterns

4．Which of the following shows the organization of the passage?

 CP ：Central Point   P：point    SP： Sub-point（次要點(diǎn)）   C：Conclusion

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