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US bees operation keeping groups have been attacked seriously by so called Colony Collapse Disorder (蜂群衰竭失调).Almost 1/2 of their worker bees have vanished during the past season.This disorder has also been reported in Israel, Europe and South America.Bees fly away from the hive and never return.Sometimes they are found dead; other times they are never found.Many crops and trees depend on pollination--- by bees to help them grow.
A new report says a virus may be at least partly responsible for the disorder in honey bee colonies in the United States.This virus is called Israeli acute paralysis virus.It was first found in Israel in 2004.Lan Lipkin at Columbia University in New York and a team reported the new findings in Science Magazine.Doctor Lipkin says the virus may not be the only cause.He says it may work with other causes to produce the collapse disorder.
The team found the virus in colonies with the help of a map of honey bee genes that was published last year.They examined thirty colonies affected by the disorder.They found evidence of the virus in twenty-five of them, and in one healthy colony.The next step is further testing of healthy hives.
The researchers suggested that the United States may have imported the disorder in bees from Australia.They say the bees may carry the virus but not be affected.
The idea is that unlike many American bees, the ability of Australian bees to fight disease has not been hurt by the varroasis mite.This insect attacks honey bees, which could make the disorder more likely to affect a hive.Australian bee producers object to these suspicions.
And some researchers suspect that bee production in the United States is down mainly because of the weather.Honey bees gather nectar from flowers and trees.The sweet liquid gives them food and material to make honey.But cold weather this spring in the Midwest reduced the flow of nectar in many flowers.Many bees may have starved.Dry weather in areas of the country could also be playing apart.
Wayne Esaias is a NASA space agency scientist who keeps bees in his free time.He lives in central Maryland, where he has found that flowers are blooming a month earlier than they did in 1970, which may be partly responsible for the disorder. Wayne Esaias is organizing a group of beekeepers to document nectar flow around the country.
What is the author’s attitude toward the cause of this disorder?
A. Doubtful B. Neutral C. Supportive D. Negative
The passage is mainly developed by .
A. presenting the effect and analyzing its causes
B. making comparisons between two countries
C. providing data and examples
D. following the time order
How many possibilities may be involved in the bee disorder according to the passage?
A. Three B. Four C. Five D. Six
From the passage we can infer that .
A. American bees are more likely to defend themselves against hurt from other insects than Australian ones
B. A collection of plants production in the U.S may be influenced by the bee disorder
C. Israeli acute paralysis virus should be responsible for the disorder
D. The solution to the disorder will be found eventually
查看习题详情和答案>>When I was a child, I often dreamed of the time when I could leave home and escape to the city. We lived on a farm, in the winter especially, we wear quite out off from the outside world. As soon as I left school, I packed my bags and moved to the capital.
However, I soon discovered that one big disadvantage is money. It costs so much to go out, not to mention basics like food and housing. Another disadvantage is pollution. I suffer from asthma(哮喘), and the air is so bad that I am afraid to go outside. Then there is the problem of traveling round. Although I have a car, I seldom use it became of the traffic jams. One choice is to go by bicycle, but that can be quite dangerous.
Of course there are advantages. First, there is so much to do in the city, whatever you tastes in culture or entertainment(娱乐活动). Besides, there are wonderful jobs and greater chances of moving to a more important job or position. Finally, if you like shopping, the variety of goods is very surprising --- and , what is more, shops are often only a short walk away.
Is life better then, in the city? Perhaps it is , when you are in your teens(十几岁)or twenties. However, as you get older, and especially if you have small children, the peace of the countryside may seem preferable. I certainly hope to move back there soon.
1.
What was the writer always thinking about when he was a child ?[来源:]
A. Staying on the farm. B. Moving to the countryside.
C. Leaving home for the city. D. Running away from the school.
2.
Which of the following is true about the writer?
A. He is very old now. B. He is in good health.
C. He prefers driving a car. D. He lives in the city now.
3.
In the passage, the writer tries to __________.
A. express his opinions about way of life
B. describe his life in the countryside
C. an interest in the outside world
D. persuade the reader to live in the city
4.
How is the passage mainly developed?
A. By inferring. B. By comparing. C. By listing examples. D. By discussing.
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--Do you live____________ near Jim?
--No, he lives in another part of the town.
|
A.somewhere |
B.nowhere |
C.anywhere |
D.everywhere |
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He lives in one room and only eats once a day. He ________ have a lot of money.
A. mustn’t B. may not
C. can’t D. might not
查看习题详情和答案>>When I was a child, I often dreamed of the time when I could leave home and escape to the city. We lived on a farm, in the winter especially, we wear quite out off from the outside world. As soon as I left school, I packed my bags and moved to the capital. However, I soon discovered that my life has its problems too.
One big disadvantage is money. It costs so much to go out, not to mention basics like food and housing. Another disadvantage is pollution. I suffer from asthma(哮喘), and the air is so bad that I am afraid to go outside. Then there is the problem of traveling round. Although I have a car, I seldom use it became of the traffic jams. One choice is to go by bicycle, but that can be quite dangerous.
Of course there are advantages. First, there is so much to do in the city, whatever you tastes in culture or entertainment(娱乐活动). Besides, there are wonderful jobs and greater chances of moving to a more important job or position. Finally, if you like shopping, the variety of goods is very surprising --- and , what is more, shops are often only a short walk away.
Is life better then, in the city? Perhaps it is , when you are in your teens(十几岁)or twenties. However, as you get older, and especially if you have small children, the peace of the countryside may seem preferable. I certainly hope to move back there soon.
1.What was the writer always thinking about when he was a child?
|
A.Staying on the farm. |
B.Moving to the countryside. |
|
C.Leaving home for the city. |
D.Running away from the school. |
2.Which of the following is true about the writer?
|
A.He is very old now. |
B.He is in good health. |
|
C.He prefers driving a car. |
D.He lives in the city now. |
3. In the passage, the writer tries to __________.
|
A.express his opinions about way of life |
B.describe his life in the countryside |
|
C.an interest in the outside world |
D.persuade the reader to live in the city |
4.How is the passage mainly developed?
|
A.By inferring. |
B.By comparing. |
|
C.By listing examples. |
D.By giving explanations. |
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