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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.
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People like to celebrate when they move into a new home. Maybe it’s the first flat someone has owned，a couple’s first home since getting married or maybe a growing family has moved to a bigger house. For whatever reason，the home is new. It represents a change and an exciting new beginning，with walls to paint，rooms to decorate and neighbors to meet．And what better way to meet people than to throw a party?
Parties to celebrate moving into a new home are called "house一warming" or“flat一warming" parties. If you think about it，they，re appropriate names because an empty house with no people or furniture in it is a cold shell of a place. A house full of people，on the other hand，often requires some open windows or air conditioning to keep from getting too hot.
So what are house一warming parties like? Usually，the hosts invite their new neighbors as well as their friends. They usually provide some food and drinks and guests usually bring house一warming gifts. The gift might be something for the house，like a plant，or something for the guests to share，like a bottle of wine. There may be a dress code or theme. For example，if it is a“Hat Party"，people will wear unusual or funny hats. This helps break the ice by making people laugh. This makes it easier to meet new people and creates a fun and cheerful atmosphere.
"There’s an old saying that“home is where the heart is"．When people throw a house一warming party，they’re opening their hearts as well as their homes to the people around them. So if you’re ever invited by new neighbors to a house一warming，go！Then invite them to your home another time. Your home might already be warm，but new friends are the surest way to warm your heart.
1．Why would a family be described as“growing"？
A．Grandparents are moving in with the family.
B．The members of the family are growing taller.
C．A child or children are being born to that family.
D．The members of the family are putting on weight.
2．Why is the name“house一warming" appropriate according to the writer?
A．It’s the opposite of a house一cooling party.
B．A house or flat with people in it seems to be lively.
C．When people drink wine at these parties they get very warm.
D．At these parties there is always a fire that people sit around to warm themselves.
3．What does the underlined phrase“break the ice" mean in a social situation?
A ．It means to get conversation flowing.
B．It means to make a hole in the ice through which to fish.
C．It means conversation is very difficult because people don’t know each other.
D．It means the atmosphere at a house一warming party is very cold and unfriendly.
4．Why does the writer suggest that you invite people to your home？
A．It can show your politeness to your neighbours.
B．Everyone should have a house一warming.
C．:Making new friends will make you happy.
D．Inviting them will warm up your cold house.
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My House
My mother moved a lot when she was growing up on account of Grandpa being in the army. She hated having to adjust to new schools and make new friends. That’s why I thought she was joking when she put forward the idea of moving. But she was completely serious. “For just the two of us,” my mother said, “an apartment in the city will suit our needs much better.” Personally, I think she’s lost her mind. I guess I can understand why she would want to move, but what about me and what this house means to me?
I suppose if you looked at my house, you might think it was just another country house. But to me it is anything but standard. I moved into this house with my parents ten years ago. I can still remember that first day like it was yesterday. The first thing I noticed was the big front yard. To me it seemed like an ocean of grass—I couldn’t wait to dive in. The backyard was full of gnarled (扭曲的, 粗糙的) and scary trees that talk on windy nights. But I grew to like them and the shadows they cast in my room. My father and I even built a small tree house, where I often go to remember all the wonderful times we had before Father’s death.
This house is special—maybe only to me—but special nevertheless. It’s the little seemingly insignificant things that make this house so special to me: the ice-cold tile floors that make me tremble on midnight snack runs; the smell of my father’s pipe that still exists; the towering bookcases of my mother; the view outside my bedroom window.
This house holds too many memories, memories which would be lost if we gave it up.
59. Why did the author’s mother decide to move?
A. Because she hated the countryside.
B. Because Grandpa was on constant move.
C. Because Dad’s death made her lose her mind.
D. Because she thought a city flat more fit for them.
60. What impressed the author when she first moved into the house?
A. The tree house. B. The big trees.
C. The cold floors. D. The green grass.
61. How did the author let us feel that the house was special to her?
A. By arguing whether the house was standard.
B. By explaining why the house suited their needs.
C. By describing the small things related to her house.
D. By comparing the differences between country and city life.
62. The author describes the house with ______.
A. affection B. responsibility C. commitment D. enthusiasm
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