On June 26, 2000, two scientists, called Francis Collins and Craig Venter, told the world that they could read the whole “map” of the human body: DNA. DNA is something that everybody has, and it tells the body what to do. DNA is the reason that we look like our mother and father, because we get some of their DNA to make our own.

People have been trying to understand the human body for a long time. In 1860, Gregor Mendel discovered a special reason why we look the same as other people in our family. It is because of small things named “genes” in our body. In 1953, James Watson and Francis Crick made another discovery and found out that those small parts are real messages written in the DNA with a special language.

In 1961, Marshall Nirenberg and Johann Matthaci found a message in DNA showing how DNA tells the cell（细胞）to build its parts. Scientists have now found all the words in the DNA map, but we still do not understand what they all do. By understanding what just one “word”   means, we can help save more people from several illnesses.

Most people hope that this will help make better medicine and help sick people. Other people worry that when people begin to know more words and find out lots of other information, we might use it in a wrong way, just to make people more attractive, or stop sick people from getting jobs. Man would have to meet a lot of trouble if DNA technic wasn’t limited（限制）in use.

(  ) 51. When did we first know why we look like other people m our family?

A. In 1860．      B. In 1953．       C. In 1961．      D. In 2000．

(  ) 52. What does the underlined word “ genes” mean?

A. The “map” of DNA.                B. A special language.

C. Small parts of DNA.                D. DNA.  ,,

(  )53. What did the two scientists first discover in 1961 ?

A. The “map” of DNA.                B. A new illness.        

C. The language of DNA.              D. A message of DNA.

(  ) 54. What can we do if we understand some “ words” of the language inside the body

A. Make people get new jobs.           B. Make medicine for illnesses.

C. Make maps of human.               D. Make people less attractive.

(  ) 55. What do people think about this work’?

A. It can cause good or bad results.               B. It can cause only good results.

C. It can cause good results but won’t work.        D. It can cause only bad results.

In America, where labor（劳工）costs are so high, “do-it-yourself” is a way of life．Many people   46   their own cars, build their own garages, and even rebuild their own houses．

  47   many of them will also write their own books. In Hollywood there is a   48   that publishes（出版）children’s books with the help of computers．  49   other book companies also publish that way, this company is not like the others．It   50   the reader to become the main character（人物）with the help of computers．Here is   51   they do it．Let us suppose a child is named Jody．The computer uses this information to make up a story   52   pictures．The story is then printed up．“This book is about me,” a child who   53   such a book might say．So the company is called the “Me-Books Publishing Company”．  54   like me-books because they like to see in print their own names, their pictures, the names of their friends and their pets．But more   55  , in this way, readers are much more interested in reading the stories．Me-books are helping children to learn how to read．

（    ）46．A．make               B．build                C．buy                       D．repair

（    ）47．A．Otherwise      B．Only              C．Once                  D．Soon

（    ）48．A．director        B．person           C．company              D．computer

（    ）49．A．However         B．Although        C．That                  D．Unless

（    ）50．A．allows          B．hates            C．hires（雇）          D．pays

（    ）51．A．what            B．how             C．why                     D．where

（    ）52．A．with            B．about            C．for                         D．except

（    ）53．A．prints（印）    B．borrows        C．sells                     D．receives

（    ）54．A．Writers        B．Children          C．Companies            D．Friends

（    ）55．A．impossible       B．interesting        C．important              D．expensive

To learn a foreign language well, you need to spend a lot of time on it. The ___46___ time you spend on the language, the faster you will learn. This does not ___47___ sitting in class looking out of the window, nor listening to other students who do not speak well. This means spending time enjoyably on the ___48___ you are learning.

Listen to the language you are learning on your MP3 player. Read ___49___ you are listening to. Listen to and read things that you like, things that you can mostly ___50___, or even partly understand. One hour of listening or reading is more effective（有效率）than many hours of class time. If you ___51___ listening and reading, you will improve yourself.

Build up your vocabulary lists, which you’ll need lots of. Start to notice words and how they come ___52___ as phrases. Learn these words and phrases ___53___ listening and reading. Read online, using online dictionaries, and make your own vocabulary lists. Do not ___54___ for someone else to show you the language, nor to tell you what to do, and you should discover the language by yourself, like a child growing up. Talk when you feel like it. ___55___ when you feel like. You are learning and improving. The language will become clearer in your mind. Just make sure you spend enough time on the language.