评论
打印
C
Scientists investigated why Ebola virus is so deadly when it spreads from animals to humans and then from human-to-human contact. The research team looked at the Zaire Ebola virus in an animal system to understand how it gains strength. This virus is responsible for the current outbreak in West Africa. They found that initially the animal systems were not affected by the virus, but succeeding transmission(传送) into other animals caused the virus to “hot up” and become more severe.
The team analyzed the viruses at different stages and were able to identify several changes in its genetic material that were associated with increased disease.
Professor Julian Hiscox, who led the study from the University’s Institute of Infection and Global Health, explains: “The work tells us that the evolutionary goal of Ebola virus is to become more fatal.”
“We were able to show through genetic analysis which parts of the virus are involved in this process. The information we have gathered will now allow us to monitor for such changes in an outbreak as well as develop future treatment strategies.”
Professor Roger Hewson, leading the study from Public Health England, Porton Down, said: “Ebola virus is such a destructive infection to the people affected by the disease and the economy of West Africa.”
“Our understanding of Ebola virus biology is way behind that of other viruses and our cooperation shows how we can bring together our specialists’ skills to close this knowledge gap.”
Professor Miles Carroll, a co-author of the work, said: “This study has allowed the team to be at the forefront of developing methodologies to analyze patient samples recently taken by the European Mobile Laboratory from West Africa to understand disease evolution during the current outbreak.”
29. What does the first paragraph mainly tell us?
A. How severe Ebola virus is.
B. How Ebola virus spreads.
C. How Ebola virus gradually becomes deadly.
D. What contributions scientists have made on Ebola virus.
30. Which of the following statements is mentioned in the passage?
A. In the first stage, the virus hurts its victims much.
B. As the virus spreads, it’ll change and become more and more deadly.
C. The research in Ebola virus is more advanced than that in other viruses.
D. The scientists have a negative attitude to the research in Ebola virus.
31. The underlined word “fatal” has the closest meaning to ______.
A. optimistic B. deadly C. common D. fantastic
32. Where can we probably read this passage?
A. In a science report. B. In a storybook.
C. In an advertisement. D. In a textbook.
D
Much meaning can be conveyed, clearly, with our eyes, so it is often said that eyes can speak.
Do you have such kind of experience? In a bus you may look at a stranger, but not too long. And if he is sensing that he is being stared at, he may feel uncomfortable.
The same in daily life. If you are looked at for more than necessary, you will look at yourself up and down, to see if there is anything wrong with you. If nothing goes wrong, you will feel angry toward others’ stare at you that way. Eyes do speak, right?
Looking too long at someone may seem to be rude and aggressive. But things are different when it comes to stare at the opposite sex. If a man glances at a woman for more than 10 seconds and refuses to move his gaze, his intentions are obvious, that is, he wishes to attract her attention, to make her understand that he is admiring her.
However, the normal eye contact for two people engaged in conversation is that the speaker will only look at the listener from time to time, in order to make sure that the listener does pay attention to what the former is speaking, to tell him that he is attentive.
If a speaker looks at you continuously when speaking, as if he tries to dominate you, you will feel uncomfortable. A poor liar usually exposes himself by looking too long at the victim, since he believes in the false idea that to look straight in the eye is a sign of honest communication. Quite the contrary.
In fact, continuous eye contact is confined to lovers only, who will enjoy looking at each other tenderly for a long time, to show affection that words cannot express.
Evidently, eye contact should be done according to the relationship between two people and the specific situation.
33. Which of the following behaviors is proper according to the passage?
A. To the opposite sex, stare at him or her.
B. To a stranger, avoid looking at him or her.
C. In a conversation, look at the listener all the time.
D. Make eye contact depending on the relationship and different situations.
34. If two persons exchange eye contact gently for long, what is probably their relationship?
A. Boss and employee. B. Lovers. C. Teacher and student. D. Strangers
35. What’s the best title of the passage?
A. Don’t stare at others B. Body language is important
C. Eyes can speak D. Eye contact benefits you
