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I have twin brothers, Tim and Tom. They look the same and l  1.   of people don’t know who is who. They are   2.   /tl / and thin. They have brown hair and blue   3.   (眼睛), and they always wear jeans and T-shirts.

They like eating the same food, and they like doing the same things, too. For example, tomatoes and   4.   (土豆) are their favorite food. They enjoy   5.   (游泳) and playing football. They’d like to play computer games every n  6.  , but our mother says they can’t because they have much   7.  (家庭作业) to do.

They’re twins, but they aren’t the same in everything. For example, Tim works very   8.   /hd/ at school, but Tom doesn’t. Tim’s favorite subject is math but Tom is   9.   (感兴趣的) in history.

Our mother often   10.  (离开) home for her job, so we all help with the housework at home.

I think it’s fun to have twin brothers. We are all happy to be brothers in the same family.

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.
【小题1】When did we first know why we look like other people m our family?

An old farmer lived with his grandson. Each morning, the   16   got up early and read his Bhagavad Gita(薄迦梵歌).

    One day the grandson asked, “Grandpa! I try to read the book like you   17   I can’t understand it, and I forget it easily. What’s the   18   of reading it?”

   The grandfather said, “Take this coal(煤炭) basket down to the   19   and bring me back a basket of water.”

   The boy did as his grandfather   20   ,but all the water ran   21   he got home. The grandfather laughed, “You’ll have to move faster next time.”

   This time the boy   22   faster, but again the basket was empty. He told his grandfather that is was   23   to carry water in a basket. He wanted to use a bottle instead, but the old man said, “I just want a basket of water. You’re not   24   hard enough.”

   The boy wanted to show his grandfather that the water would surely run. He again put the   25   into the river and ran hard. But there wasn’t anything in it again. He said   26   ,“Look, grandpa, it’s useless!”

   “Watch the basket.” said the grandfather.

   For the first time the boy   27   the basket was different. It had changed from a dirty old coal basket into a   28   one, inside and out.

   “Boy, you might not understand or remember   29   when you read the book, but when you read it, you will be   30   ,inside and out. That’s what you got from it.”

1.A. son            B. father            C. grandfather             D. grandmother

2.A. so             B. but              C. or                     D. and

3.A. time           B. place             C. use                   D. habit

4.A. house          B. beach            C. lake                   D. river

5.A. said           B. saw              C. liked                  D. did

6.A. as             B. after             C. until                  D. before

7.A. ran            B. rode             C. drove                 D. flew

8.A. difficult        B. interesting        C. impossible             D. unimportant

9. A. hitting          B. trying            C. holding               D. studying

10.A. hand           B. bottle            C. basket                 D. coal

11.A. sadly           B. hopefully       C. excitedly                D. happily

12. A. forgot          B. realized        C. believed                 D. remembered

13. A. white           B. clean          C. new                    D. black

14.A. nothing         B. something      C. anything                 D. everything

15.A. different        B. relaxed         C. curious                  D. worried

1. My uncle is a farmer. He works on a f________.

2.Look! The new furniture is made of w_________.

3.Wash your hands and wipe them with the t________.

4.You should w_______ these flowers every day.

5.I will help Grandma l________ the fire.

An old farmer lived with his grandson. Each morning, the   16  got up early and read his Bhagavad Gita(薄迦梵歌).
One day the grandson asked, “Grandpa! I try to read the book like you   17  I can’t understand it, and I forget it easily. What’s the   18  of reading it?”
The grandfather said, “Take this coal(煤炭) basket down to the   19  and bring me back a basket of water.”
The boy did as his grandfather   20  ,but all the water ran   21  he got home. The grandfather laughed, “You’ll have to move faster next time.”
This time the boy   22  faster, but again the basket was empty. He told his grandfather that is was   23  to carry water in a basket. He wanted to use a bottle instead, but the old man said, “I just want a basket of water. You’re not   24  hard enough.”
The boy wanted to show his grandfather that the water would surely run. He again put the   25  into the river and ran hard. But there wasn’t anything in it again. He said   26  ,“Look, grandpa, it’s useless!”
“Watch the basket.” said the grandfather.
For the first time the boy   27  the basket was different. It had changed from a dirty old coal basket into a   28  one, inside and out.
“Boy, you might not understand or remember   29  when you read the book, but when you read it, you will be   30  ,inside and out. That’s what you got from it.”