B
What weighs 3500 pounds(1600kg)and lived 60 million years ago?Are you thinking of
dinosaurs?Guess again!You don,t have to go to a museum to see these creatures．They are alive
and swimming in the warm coastal waters of Florida．
Manatees(海牛)have lived a peaceful existence in the warm waters  of  Florida  for  60
million years．However，they are now an endangered species．This means that if humans don,t do
something to save them，they will soon go the way of dinosaurs．
Humans have made life very difficult for manatees．One big danger that humans have
introduced is the speedboat．Because manatees are mammals．they need to come to the surface to breathe about every 5 to 6 minutes．This means that they are in constant danger of being caught in the propellers(螺旋桨)of speedboats．And boating aceidents are the greatest cause of death for them．
Manatees are in extra danger when they are in their sleeping or“torpor”state．They still
have to come to the surface for the air，but sometimes they are too sleepy to avoid the danger of approaching boats．
Another danger for manatees is the pollution that humans produce．Due to human pollution，
a deadly plant called red tide had increased greatly in the Gulf of Mexico．The plant，or algae，
t11riVes(繁茂)on pollution．It wiped out nearly 20 percent of the total manatee population on
earth．
Humans can help to save manatees。The government has established boating speed limits to
give the manatees．a chance to escape approaching speedlsoats．Everyone can help by cutting
down on waste and pollution to protect the waters for the manatees．
One famous singer，Jimmy Buffet，has helped save the manatees．He co-founded the Save the Manatee Club(SMC)．SMC had begun an adoption(收养)program for the manatees．For a fee，sponsors(资助者)can name a manatee．Donations are used to help protect the manatees and their habitat．
45．The manatee is the kind of animal that___________．
A．1ikes living in the cold waters of Florida      B．will die out if not protected in time
C．call dive in the deep sea for hours             D．is the biggest living animal on earth
46．Why is it dangerous for manatees to be in a torpor state?
A．Because they come to the snlface to breathe，and that is when they are hunted．
B．Because they eat deadly algae，and this makes them too sick to avoid danger．
C．Because they live in groups and therefore they are easily hurt by passing boats．
D．Because they are sleepy when they surface，so they can,t avoid approaching boats．
47．The death of the manatees is largely due to__________．
A．human hunting                       B．human pollution
C．speedboat accidents                  D．deadly plants
48．To help protect manatees，people should_________．
A．never go speed boating in their living habitat
B．keep the waters of Florida free from pollution
C．have manatess named by sponsors without a fee
D．wake manatees up from their torpor state

C
When it comes to friends, I desire those who will share my happiness, who possess wings of their own and who will fly with me. I seek friends whose qualities illuminate（照亮）me and train me up for love. It is for these people that I reserve the glowing hours, too good not to share.
When I was in the eighth grade, I had a friend. We were shy and “too serious” about our studies when it was becoming fashionable with our classmates to learn acceptable social behaviors. We said little at school, but she would come to my house and we would sit down with pencils and paper, and one of us would say:“Let’s start with a train whistle today.” We would sit quietly together and write separate poems or stories that grew out of a train whistle. Then we would read them aloud. At the end of that school year, we, too, were changing into social creatures and the stories and poems stopped.
When I lived for a time in London, I had a friend, He was in despair(失望)and I was in despair. But our friendship was based on the idea in each of us that we would be sorry later if we did not explore this great city because we had felt bad at the time. We met every Sunday for five weeks and found many excellent things. We walked until our despairs disappeared and then we parted. We gave London to each other.
For almost four years I have had remarkable friend whose imagination illuminates mine. We write long letters in which we often discover our strangest selves. Each of us appears, sometimes in a funny way, in the other’s dreams. She and I agree that, at certain times, we seem to be parts of the same mind. In my most interesting moments, I often think:“Yes, I must tell….”We have never met.
It is such comforting companions I wish to keep. One bright hour with their kind is worth more to me than the lifetime services of a psychologist（心理学家），who will only fill up the healing（愈合的）silence necessary to those darkest moments in which I would rather be my own best friend.
69. In the eighth grade, what the author did before developing proper social behavior was to ______.
A. become serious about her study
B. go to her friend’s house regularly
C. learn from her classmates at school
D. share poems and stories with her friend
70. In Paragraph 3, “We gave London to each other” probably means ______.
A. our exploration of London was a memorable gift to both of us
B. we were unwilling to tear ourselves away from London
C. our unpleasant feeling about London disappeared
D. we parted with each other in London
71. According to Paragraph 4, the author and her friend _______.
A. call each other regularly
B. have similar personalities
C. enjoy writing to each other
D. dream of meeting each other
72. In the darkest moments, the author would prefer to ______.
A.need professional help       B. be left alone
C. stay with her best friend    D. break the silence

C

When an ant dies, other ants take it out of the nest, often within an hour after its death. This behavior interests scientists and they wonder how ants know for sure--and so soon--that another ant is dead.

One scientist recently came up with a way to explain this ant behavior. Dong-Hwan Choe is a biologist, a scientist who studies animals and plants. He found that ants have a chemical on the outside of their bodies that signals to other ants, “I’m dead--take me away” when it is dead.

One scientist recently came up with a way to explain this ant behavior. Dong-Hwan Choe is a biologist, a scientist who studies animals and plants. He found that ants have a chemical on the outside of their bodies that signals to other ants, “I’m dead---take me away” when it is dead.

But there's a question to answer: As we know, if an ant is dead, it stops moving. But when an ant is sleeping or knocked unconscious, it is also not moving. However, other ants don't move the living ant out of the nest. How do they know this ant is not dead? Choe found that ants have another chemical on their bodies, which tells nearby ants something like, “Wait—I'm not dead yet” when it is not dead. Choe suspects that when an ant dies, the chemical that says, “Wait— I'm not dead yet” quickly goes away. When other ants detect the “dead” chemical without the “not dead yet” chemical, they move away the body.

To test his theory, Choe and his team put different chemicals on ants. When the scientists used the “I'm dead” chemical, other ants quickly moved the treated ant away. When the scientists used the “Wait—I'm not dead yet” chemical, other ants left the treated ant alone. Choe believes this behavior shows that the “not dead yet” chemical overrides the “dead” chemical when picked up by other ants. And that when an ant dies, the “not dead yet” chemical fades away. Other nearby ants then detect the remaining “dead” chemical and remove the body from the nest.

Understanding this behavior can help scientists figure out how to stop ants from invading new places and causing problems.

1.What is the function of the first paragraph?

A. Leading the following paragraphs.

B. Showing the main idea of the passage.

C. Introducing the background of the passage.

D. Giving a summary of the passage.

2.Which of the following has the closest meaning to the underlined word “overrides” in the fourth paragraph?

A. is weaker than          B. is stronger than    C. is better than                     D. is worse than

3.What can we learn from the passage?

A. Living ants can also be taken away when they are not moving.

B. When an ant dies, it can tell others using a certain chemical.

C. A living ant can pretend to be dead using a special chemical.

D. Ants often use chemicals to communicate with each other.

4.Which of the following descriptions about Dong-Hwan Choe is right?

A. Choe did this study in order to stop ants from invading new places.

B. Choe is a biologist who is only interested in animals, especially in ants.

C. Choe first came up with an idea to explain this ant behavior，and then did some tests to prove his theory.

D. Choe did the research on this ant behavior on his own.

B

What weighs 3500 pounds(1600kg)and lived 60 million years ago?Are you thinking of

dinosaurs?Guess again!You don,t have to go to a museum to see these creatures．They are alive

and swimming in the warm coastal waters of Florida．

Manatees(海牛)have lived a peaceful existence in the warm waters  of  Florida  for  60

million years．However，they are now an endangered species．This means that if humans don,t do

something to save them，they will soon go the way of dinosaurs．

Humans have made life very difficult for manatees．One big danger that humans have

introduced is the speedboat．Because manatees are mammals．they need to come to the surface to breathe about every 5 to 6 minutes．This means that they are in constant danger of being caught in the propellers(螺旋桨)of speedboats．And boating aceidents are the greatest cause of death for them．

Manatees are in extra danger when they are in their sleeping or“torpor”state．They still

have to come to the surface for the air，but sometimes they are too sleepy to avoid the danger of approaching boats．

Another danger for manatees is the pollution that humans produce．Due to human pollution，

a deadly plant called red tide had increased greatly in the Gulf of Mexico．The plant，or algae，

t11riVes(繁茂)on pollution．It wiped out nearly 20 percent of the total manatee population on

earth．

Humans can help to save manatees。The government has established boating speed limits to

give the manatees．a chance to escape approaching speedlsoats．Everyone can help by cutting

down on waste and pollution to protect the waters for the manatees．

One famous singer，Jimmy Buffet，has helped save the manatees．He co-founded the Save the Manatee Club(SMC)．SMC had begun an adoption(收养)program for the manatees．For a fee，sponsors(资助者)can name a manatee．Donations are used to help protect the manatees and their habitat．

45．The manatee is the kind of animal that___________．

A．1ikes living in the cold waters of Florida      B．will die out if not protected in time

C．call dive in the deep sea for hours             D．is the biggest living animal on earth

46．Why is it dangerous for manatees to be in a torpor state?

A．Because they come to the snlface to breathe，and that is when they are hunted．

B．Because they eat deadly algae，and this makes them too sick to avoid danger．

C．Because they live in groups and therefore they are easily hurt by passing boats．

D．Because they are sleepy when they surface，so they can,t avoid approaching boats．

47．The death of the manatees is largely due to__________．

A．human hunting                       B．human pollution

C．speedboat accidents                  D．deadly plants

48．To help protect manatees，people should_________．

A．never go speed boating in their living habitat

B．keep the waters of Florida free from pollution

C．have manatess named by sponsors without a fee

D．wake manatees up from their torpor state

D

If you are in town in a western country, you will often see people walking with their dogs. It is still true that a dog is the most useful animal in the world, but the reason why one keeps a dog has changed. Once upon a time, a man met a dog and wanted it to help him in the fight against other animals，and he found that the dog listened to him and did what he told it to. Later people used dogs for the hunting of other animals, and the dogs didn't eat what they got until their masters agreed, so dogs were used for driving sheep and guarding chickens. But now the people in the towns and cities do not need dogs to hunt other animals. Of course they keep them to frighten thieves, but the most important reason is that people feel lonely in the city. For a child, a dog is his best friend when he has no friends to play with. For a young wife, a dog is her child when she doesn't have her own. For old people, a dog is also a child when their real children have grown up and left. Now people do not have to use a dog but they keep it as a friend, just like a member of the family.

49. In town in a western country, dogs are often seen to ________.

       A. walk with hunters               B. walk with their masters

       C. fight against other animals         D. play with other animals

50. Which of the following is NOT true according to the passage?

       A. People used to keep dogs to protect their house birds.

       B. Dogs were used to hunt other animals.

       C. Dogs will eat what they've got.

       D. Dogs can perhaps drive thieves away.

51. The main reason why people in towns and cities raise dogs now is that ________.

       A. they want dogs to frighten thieves for them

       B. they use dogs for the hunting of other animals

       C. they train dogs to drive sheep

       D. they want to keep the dogs as friendly members of their families

52. The sentence "Now people do not have to use a dog" means ________.

       A. a dog is not as useful as it was before

       B. that it isn't necessary for people to use dogs to serve them

       C. it isn't necessary for people to keep dogs any longer

       D. people don't feel lonely now