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To speed up the ________ of letters, the Post Office introduced automatic sorting.
A.treatment
B.delivery
C.transmission
D.departure
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A.treatment
B.delivery
C.transmission
D.departure
When an ant dies,other ants move the dead insect out of the nest.This behavior. is interesting to scientists,who wonder how ants know for sure-and so soon-that another ant is dead.
Dong-Hwan Choe,a scientist at the University of California,found that Argentine ants have a chemical on the outside of their bodies that signals to other ants,“I’m dead-take me away.”
But there's a twist to Choe's discovery.Choe says that the living ants-not just the dead ones -have this death chemical.In other words,while an ant crawls around,perhaps in a picnic or home,it's telling other ants that it's dead.
What keeps ants from hauling away the living dead?Choe found that Argentine ants have two additional chemicals on their bodies,and these tell nearby ants something like,“Wait-I'm not dead yet.” So Choe's research turned up two sets of chemical signals in ants:one says,“I'm dead,”the other set says,“I'm not dead yet.”
Other scientists have tried to figure out how ants know when another ant is dead.If an ant is knocked unconscious,other ants leave it alone until it wakes up.That means ants know that unmoving ants can still be alive.
Choe suspects that when an Argentine ant dies.the chemical that says“Wait-I'm not dead yet” quickly goes away.Once that chemical is gone,only the one that says“I'm dead”is left.“It's because the dead ant no longer smells like a living ant that it gets carried to the graveyard(墓地),not because its body releases new,unique chemicals after death,”said Choe.When other ants detect the“dead”chemical without the“not dead yet”chemical,they haul away the body.This was Choe's hypothesis(假设).
To test his hypothesis,Choe and his team put different chemicals on Argentine ant pupae(蛹). When the scientists used the“I'm dead”chemical,other ants quickly hauled the treated pupae away. When the scientists used the“Wait-I'm not dead yet”chemical,other ants left the treated pupae alone. Choe believes this behavior. shows that the“not dead yet”chemical overrides(优胜于)the“dead”chemical when picked up by adult 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.
The phrase“this death chemical”in paragraph 3 refers to
A.the chemical that contains poison.
B.the chemical that announces death.
C.the chemical that prevents death.
D.the chemical that causes death.
When an ant dies,other ants move the dead insect out of the nest.This behavior. is interesting to scientists,who wonder how ants know for sure-and so soon-that another ant is dead.
Dong-Hwan Choe,a scientist at the University of California,found that Argentine ants have a chemical on the outside of their bodies that signals to other ants,“I’m dead-take me away.”
But there's a twist to Choe's discovery.Choe says that the living ants-not just the dead ones -have this death chemical.In other words,while an ant crawls around,perhaps in a picnic or home,it's telling other ants that it's dead.
What keeps ants from hauling away the living dead?Choe found that Argentine ants have two additional chemicals on their bodies,and these tell nearby ants something like,“Wait-I'm not dead yet.” So Choe's research turned up two sets of chemical signals in ants:one says,“I'm dead,”the other set says,“I'm not dead yet.”
Other scientists have tried to figure out how ants know when another ant is dead.If an ant is knocked unconscious,other ants leave it alone until it wakes up.That means ants know that unmoving ants can still be alive.
Choe suspects that when an Argentine ant dies.the chemical that says“Wait-I'm not dead yet” quickly goes away.Once that chemical is gone,only the one that says“I'm dead”is left.“It's because the dead ant no longer smells like a living ant that it gets carried to the graveyard(墓地),not because its body releases new,unique chemicals after death,”said Choe.When other ants detect the“dead”chemical without the“not dead yet”chemical,they haul away the body.This was Choe's hypothesis(假设).
To test his hypothesis,Choe and his team put different chemicals on Argentine ant pupae(蛹). When the scientists used the“I'm dead”chemical,other ants quickly hauled the treated pupae away. When the scientists used the“Wait-I'm not dead yet”chemical,other ants left the treated pupae alone. Choe believes this behavior. shows that the“not dead yet”chemical overrides(优胜于)the“dead”chemical when picked up by adult 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.
The phrase“this death chemical”in paragraph 3 refers to
A.the chemical that contains poison.
B.the chemical that announces death.
C.the chemical that prevents death.
D.the chemical that causes death.
Why should this be? From the complexity of causes responsible for the present commonplace interview form, a few are worth singling out, such as the revolt against rationality and the worship of feeling in its place. To the young of the 60s, the painstaking search for understanding of a given political problem may have appeared less fruitful and satisfying than the free expression of emotion which the same problem generated. Sooner or later, broadcasting was bound to reflect this.
This bias against understanding has continued. To this we must add the professional causes that have played their part. The convention of the broadcast interview had undergone little change or radical development since its rise in the 50s. When a broadcasting form. ceases to develop, its practitioners tend to take it for granted and are likely to say "how" rather than ask "why".
Furthermore, these partly psychological, partly professional tendencies were greatly accelerated by the huge expansion of news and current affairs output over the last 15 years. When you had many, additional hours of current affairs broadcasting, interviewing turned out to be a far cheaper convention than straight reporting, which is costly in terms of permanent reporters and time preparation. The temptation to combine an expanded news and current affairs service with a relatively small additional financial expense by making the interview happen everywhere proved overwhelming.
To be fair, there are compensating virtues in interviewing, such as immediacy and authority, yet in all honesty I must say that the spread of the interviewing arrangement has led to a corresponding diminution of quality broadcasting.
According to the author, in the past politicians thought that television interviewers ______.
A.knew more about politics than they did
B.should be honoured to meet them
C.really were eager to be politicians too
D.gave them a difficult time in interviews
A、greater the elasticities of supply and demand, the greater the deadweight loss.
B、smaller the elasticities of supply and demand, the greater the deadweight loss.
C、greater the decrease in both quantity demanded and quantity supplied, the greater the deadweight loss.
D、primary factor that determines the size of the deadweight loss in the percentage tax is of price.
Read the sentences and choose the correct ones. Brenda has just moved to a new school and has made a new friend, Paula. They are sitting in a snack bar after school talking. Paula asks Brenda," Tell me about your family." Brenda: "My family is a rather small one, with only three people, my father, my mother and me. My father is a doctor. My mother is a teacher. My mother is very patient and understanding while my father is not very patient. He is often quite loud and wants things to happen at once. We love each other very much. Although sometimes we might fight about things we feel strongly about, very soon we will change the subject and discuss something else. We're a happy family. How about you? Paula: "I have a big family with seven people, my grandparents, parents, two older brothers and me. We all live together in a big house. It is often very noisy in our house, especially at dinner time. Grandfather has a loud voice. But it is nice having my grandparents living with us. That means that when I come home from school there is always somebody there for me. We take care of one another, share housework, and often communicate all together. My brothers help me with problems I have with homework and I help them with problems they have with girls."
A、Brenda's father is patient.
B、Brenda is patient.
C、Brenda's mother is a patient.
D、Brenda's mother is patient.
A、4th March, 2018
B、March 4th, 2018
C、4 March, 2018
D、4/3/2007
A、Indented Style
B、Full Block Style
C、Modified Block Style
D、Semiblock Style with Indented Paragraphs.
请同学们将正确选项的字母序号以大写的方式填入空格。比如ABC... Dear Sirs, We are (1) to buy large quantity of corn and should be (2) if you would give us a (3) per metric ton FOB Los Angels, USA and (4) the earliest date you can ship. We used to (5) corn from other sources, but we now (6) to buy from your corporation because we are given o the understanding that you are able to supply larger (7) with a special (8). Besides, we are (9) that your corn is of better quality. We look forward to hearing from you by return. Yours faithfully, A.convinced B.inform C.prefer D.quantities E.purchase F.obliged G.interested H.discount I.quotation
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