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第一部分：阅读理解
Passage 1
You are unique. There are 6.5 billion people in the world but no other person is exactly like you. Besides people, there are millions of other living things. Every living thing is different from each other. Every living thing is a unique combination of characteristics.
Why is each living thing unique? Where do its characteristics come from? Do people receive characteristics from their mothers and fathers? How? The work of Gregor Mendel was especially important to help us to answer these questions.
Mendel studied plants, especially pea plants. In some way they were all the same. For example, they all had flowers. But some had red flowers, and others had white flowers. Some were tall, others were short. Mendel was especially interested in the differences. He wondered why each plant was of certain color, shape, size. He experimented with thousands of pea plants, with a careful record. And he discovered some interesting things. He mated different pea plants. First, he mated a red flower plant with a white flower plant. All of the offspring plants had red flowers. Mendel was curious about what happened to the white. Then he mated two of the offspring plants. Every time he did this, they produced three red plants and one white plant. There was the white again. So Mendel knew that even red plants somehow passed on whiteness. Mendel decided that pea plants carried factors, and the parents passed these factors onto their offspring.
Today we call these factors genes. Genes are tiny pieces of matter. They carry information from parents to offspring. Now we know that every person is unique and one reason for this is that every person is a unique combination of genes.
1. In the first paragraph, the author mainly tells us that________.
A. no other person is exactly like you
B. the total population of the world is 6.5 billion
C. every living thing is unique
D. different people have different characters
2. The work of Gregor Mendel was especially important because__ .
A. he had first set great value on pea plants
B. he was the first person to study pea plants
C. he had done a lot of experiments with thousands of pea plants
D. he had first discovered what we call genes today
3. Gregor Mendel made a special study of plant because______ .
A. few biologists were interested in studying pea plants at that time
B. he liked pea plant flowers
C. he wanted to find out why pea plants differed in shape, color and size
D. pea plants were all the same in some ways
4. By experiments Gregor Mendel proved________.
A. pea plants of different colors could not mate
B. pea plants possessed factors which could be passed onto the young
C. only redness could be passed onto the offspring if a red pea plant mated with a white one
D. pea plants had only two colors — red and white
5. Which of the following statements is true? ___________.
A. Every person is unique because he is a unique combination of genes
B. Genes only exist in plants, not in animals
C. Although there are a large number of different people in the world, there are some who look exactly alike
D. Some biologists after Gregor Mendel discovered that genes can not determine the color of one’s eyes
1-5 CDCBA
Passage 2
Some people think they have an answer to the troubles of automobile crowding and dirty air in large cities.Their answer is the bicycle，or “bike”.
In a great many cities，hundreds of people ride bicycles to work every day.In New York City，some bikers have even formed a group called Bike for a Better City.They claim that if more people rode bicycles to work there would be fewer automobiles in the downtown section of the city and therefore less dirty air from car engines.
For several years this group has been trying to get the city government to help bike riders.For example，they want the city to draw bicycle lanes on some of the main streets, because when bike riders have to use the same lanes as cars, there are accidents.Bike for a Better City feels that if there were special lanes more people would use bikes.
But no bicycle lanes have been drawn.Not everyone thinks it is a good idea—they say it will slow traffic.Some store owners on the main streets say that if there is less traffic，they will have less business. And most people live too far from downtown to travel by bike.
The city government has not yet decided what to do.It wants to keep everyone happy.Only on weekends, Central Park is closed to cars，and the roads may be used by bicycles only.But Bike for a Better City says this is not enough and keeps fighting to get bicycle lanes downtown.
6.According to the passage，bicycles________.
A.are more convenient than cars
B.are safer traffic tools than cars
C.are ridden by most people in the U.S.
D.are the solution to some city problems
7.The idea of special bicycle lanes is most favored by_________.
A.the city government B.some bike riders
C.people living far from downtown D.some store owners
8.“Bicycle lanes” in the third paragraph probably means ______.
A. narrow passages between buildings for bicycles
B.roads full of bicycles
C. special parts of the road for bicycle riders only
D.roads for bicycles only
9.Which of the following is not true according to the passage?
A.Bike for a Better City members ride bicycles to work.
B.Sometimes accidents may occur when cars and bikes are on the same lanes.
C.The Central Park is closed to cars on weekends.
D.In New York City.many people use bikes as they have special lanes.
10.The best title for this passage is _________.
A.Traffic Crowding in New York City
B.Air Pollution in New York City by Cars
C.Special Lanes for Passengers
D.A Solution to Traffic Problem in New York
6-10 DBCDD
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