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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.
查看习题详情和答案>>If you often have a cold, headache or backache, there is something wrong with your health. Eating healthy food 43 good for our health. Tofu（豆腐）, milk, vegetables are healthy for us.
Tofu is a kind of traditional（传统的） 44 food. We often 45 it in China. Now more and more people 46 other countries think tofu is good for health, 47 . They also like eating it.
Milk is 48 kind of healthy food. Every day you should 49 one or two glasses of milk. It can 50 us strong.
Vegetables are very important. You should eat 51 them. There are vitamin(维他命) A, B, C, D , E and so on in them.
As we know, it’s important 52 a balanced diet(均衡饮食). We must have the right kinds of food. We should also eat some pork, chicken and beef. We should eat more fruit and vegetables but less meat.
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Our teacher takes us for a trip each term. During my first trip, we went to Couzy, Laon, Lille and Amiens. They are all in Northern France. Forty-one students went along with three of our teachers. The first place we went to was an old palace on the top of a mountain. It was very beautiful. The next place was the village of Laon. We visited a Notre Dame Cathedral there.
After we visited the two places, we then went to Lille, the fifth largest city in France. We walked around Lille and looked at different buildings. All were very interesting and each teacher told us what they think of each building. This became a more interesting way for us to learn architecture（建筑学）. The next day we traveled to Amiens to look at another Notre Dame Cathedral. Amiens is a n
ice little town. As there was a famous university（大学）,we were able to see how other French students lived and studied.
The trip was great.且was tiring but. very helpful for us to understand architecture.
51. How many people took part in the trip?
A．41 B．42. C．43 D．44
52. The old palace on the top of a mountain is in _______.
A. Couzy B. Laon C. Lille D. Amiens
53. We can learn from the passage _______.
A. Lille is a nice little town
B. there is another Notre Dame Cathedral in Lille
C. there is a university in Couzy
D. the writer himself is from France
54. The underlined word "It" means________.
A. architecture B. the first lesson of this term
C. this trip D. the trip around the university
55. What's the best title for the passage?
A. Buildings in Northern France B.A Great Trip
C.A Way to Learn Architecture D. Going around France
查看习题详情和答案>>Do you often think of your parents? You may say, “Of course, I 46 . I buy a present for my mother on Mother’s Day and on Father’s Day I give my father 47 , too.” But what about the other days of the year?
I have a friend whose parents live in another city. One day I went to see her. We had a nice conversation. Then she wanted to 48 . So she dialed（拨号）the number, but then she put down the phone. After about fifteen 49 , she dialed the number again, “Hi, Mom …”
Later I asked, “ 50 did you dial the number twice?” She smiled, “My parents are old and
51 . They can’t get close to the telephone quickly. I always do so when I call them. I just want to give them 52 time to answer the call.”
My friend is a good girl. She is 53 thinking about her parents. You also want to be a 54
child, right? Please always remember to 55 your parents in every situation, not just on some important days.
（ ）46．A．will B．do C．won’t D．don’t
（ ）47．A．a cake B．a kiss C．some money D．a present
（ ）48．A．make a call B．pay a visit C．have a rest D．go for a walk
（ ）49．A．seconds B．minutes C．hours D．days
（ ）50．A．How B．What C．Why D．When
（ ）51．A．fast B．slow C．healthy D．careless
（ ）52．A．little B．quick C．no D．enough
（ ）53．A．always B．never C．seldom D．sometimes
（ ）54．A．bad B．clever C．good D．sick
（ ）55．A．think of B．look after C．ring up D．listen to
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Different things usually stand for different feelings. Red, for example, is the color of fire, heat, blood and life. People say red is an exciting and active color. They associate（使发生联系） red with a strong feeling like 46 . Red is used for signs of 47 , such as STOP signs and fire engines. Orange is the bright, warm color of 48 in autumn. People say orange is a 49 color. They associate orange with happiness. Yellow is the color of __50__. People say it is a cheerful color. They associate yellow too, with happiness. Green is the cool color of grass in __51__. People say it is a refreshing color. In general, people __52__ two groups of colors: warm colors and cool colors. The warm colors are red, orange and __53__. Where there are warm color and a lot of light, people usually want to be __54__. Those who like to be with __55 _ like red. The cool colors are __56_ and blue. Where are these colors, people are usually worried. Some scientists say that time seems to __57 _ more slowly in a room with warm colors. They suggest that a warm color is a good __58_ for a living room or a __59_ . People who are having a rest or are eating do not want time to pass quickly. __60 colors are better for some offices if the people working there want time to pass quickly.
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