A.Graffiti has another name called hiphop.
B.Graffiti appeared during the 1960s and 1970s.
C.The local governments prefer to spend money cleaning graffiti.
D.The government of the United States doesn't allow graffiti.
20.What's the article mainly about?
A.The meaning of graffiti.
B.Different expressions of graffiti.
C.Different attitudes towards graffiti.
D.The history and development of graffiti.
(五)
Can you remember the day when you spoke your first words?If you can，you are unusual.Try to think what the first few months of your life were like.I'm sure you just spent most of your time eating，sleeping and crying.As you grew older，you were awake more of the time.It took your parents more to play with you and talk to you.You watched and listened.You began to know that people make some sounds to go with some things.
Then you began to cry to make sounds you heard.And step by step you were able to make the right sound for one thing.
On that day you came to understand the secret of the language.The secret is that a certain sound means a certain thing.One sound might be as good as another.But it is not as good as a word unless everyone agrees on its meaning.Only when a group of people use the same set of sounds of things，they can understand each other，so these people have a language.
After you found the secret of language，you learned words.Some of the words meant things，such as books，chairs and shops.Some of the words meant actions such as go and swim.And other words describe things such as good or dirty. Soon you learn to put words together to express one's idea，such as“ I want to go out and play with my friends.” This is language.By the way of language people can communicate.So we say languages mean communication.
21.________can remember the day when we spoke our first words.
A.Few of us B.No one C.Most people
22.When you were a little baby，you ________.
A.made sounds to let people know that you wanted to eat
B.spent most of your time eating，playing and sleeping
C.could not hear any sounds around you
23.The secret of language is that________.
A.one sound might be as good as another
B.a certain sound is for a certain thing
C.people can understand each other
24.You could learn words________.
A.before you knew what language was
B.when you were a baby
C.after you knew what language was
25.The use of language is ________.
A.to get everything one wants from another
B.to say what one wants to know
C.to share ideas，opinions，news，etc.with one another
(六)
Everyone knows that chickens lay eggs(产卵).Most people know that all the other birds do as well.But have you ever thought about other animals that lay eggs?They include bees，snakes and some sea animals.
When a mother lays eggs，many more babies can be born at once，or in a few days，because there is very little development inside the parent.Animals that do not lay eggs often have fewer babies.Animals lay many eggs because other animals may eat the babies.However，even though some of their babies are eaten，they will still have some more to continue their family.
Some animals that lay eggs do not take care of their young.Turtles come on to the beach and dig(挖)holes.Then they put their eggs in the sand and leave.A turtle mother can lay as many as 150 eggs.When the babies come out of the eggs，they must find their own way to the ocean.They must learn how to live on their own.Many young turtles get eaten by other animals.
Most eggs have an outside shell(壳)that keeps the growing animal inside safe.The egg shell also keeps the young animal from drying out.After the animal is fully developed，it comes out of the egg.
The animal grows bigger and bigger.Then it can have its own young.
26.Which animals lay eggs?
①Snakes. ②Turtles. ③Camels. ④Bees.
⑤Chickens.
A.①③④⑤ B.①②③⑤
C.①②④⑤
27.Why do animals lay many eggs?
A.Because other animals may eat their babies.
B.Because they use their eggs for food.
C.Because they want to have fewer babies.
28.What do we know about turtles?
，我们将会及时处理。
