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scientists: the feathered navigators follow the roads just like we do.
Scientists now believe the phrase "as the crow (乌鸦) flies" no longer means the shortest most
direct route between two points. They say it is likely that crows and other day birds also choose
AA-suggested routes, even though it makes their journeys longer.
Scientists at Oxford University spent 10 years studying homing pigeons using global positioning
satellite (GPS) and got a surprising result. The birds often don't use the sun to decide their directions.
Instead they fly along motorways, turn at crossing and even go around roundabouts (绕道) , adding
miles to their journeys.
"It really has knocked our research team sideways to find that after a decade-long international
study, pigeons appear to ignore their inbuilt directional instincts (本能) and follow the road system,"
said Prof Tim Guilford, reader in animal behavior at Oxford University's Department of Zoology.
Guilford said pigeons use their own navigational system (导航系统) when doing long distance trips
or when a bird does a journey for the first time.
"But once homing pigeons have flown a journey more than once, they can fly home on a habitual
route, much as we do when we are driving or walking home from work," said Guilford.
"In short, it looks like it is mentally easier for a bird to fly down a road. They are just making their
journey as simpl e as possible."
B. Why Pigeons Can Fly long Distance?
C. How Pigeons Find Their Ways Home?
D. Why Crows Fly the Shortest Distance?
B. The crows.
C. Day birds.
D. Animals that can fly.
B. by the sun
C. by the road system
D. by following other birds
B. Because their own navigational system doesn't work.
C. Because it is too hard to use their own navigational system.
D. Because it is easier to make journey simple by following road system.
It was said that other possibilities ________ at the meeting the day before yesterday.
A. were never paid attention B. were never paying attention to
C. never paid attention to D. were never paid attention to
查看习题详情和答案>>I have no dreams _______ to have a happy life．
- A.rather than
- B.more than
- C.other than
- D.less than
The common cold is the world's most widespread illness, which is plagues(疫病) that flesh receives.
The most widespread mistake of all is that colds are caused by cold. They are not. They are caused by viruses(病毒) passing on from person to person. You catch a cold by coming into contact, directly or indirectly, with someone who already has one. If cold causes colds, it would be reasonable to expect the Eskimos to suffer from them forever. But they do not. And in isolated Arctic regions explorers have reported being free from colds until coming into contact again with infected people from the outside world by way of packages and mail dropped from airplanes.?
During the First World War soldiers who spent long periods in the trenches(战壕), cold and wet, showed no increased tendency to catch colds.?
In the Second World War prisoners at the notorious Auschwitz concentration camp(奥斯维辛集中营), naked and starving, were astonished to find that they seldom had colds.?
At the Common Cold Research Unit in England, volunteers took part in Experiments in which they gave themselves to the discomforts of being cold and wet for long stretches of time. After taking hot baths, they put on bathing suits, allowed themselves to be with cold water, and then stood about dripping wet in drafty room. Some wore wet socks all day while others exercised in the rain until close to exhaustion. Not one of the volunteers came down with a cold unless a cold virus was actually dropped in his nose.?
If, then, cold and wet have nothing to do with catching colds, why are they more frequent in the winter? Despite the most pains—taking research, no one has yet found the answer. One explanation offered by scientists is that people tend to stay together indoors more in cold weather than at other times, and this makes it easier for cold viruses to be passed on.?
No one has yet found a cure for the cold. There are drugs and pain suppressors(止痛片) such as aspirin, but all they do is to relieve the symptoms(症状).?
1. The writer offered _______ examples to support his argument.?
A. 4 B. 5 C. 6 D. 3
2. Which of the following does not agree with the chosen passage??
A. The Eskimos do not suffer from colds all the time.?
B. Colds are not caused by cold.?
C. People suffer from colds just because they like to stay indoors.?
D. A person may catch a cold by touching someone who already had one.
3. Arctic explorers may catch colds when ________.
A. they are working in the isolated Arctic regions?
B. they are writing reports in terribly cold weather?
C. they are free from work in the isolated Arctic regions?
D. they are coming into touch again with the outside world
4. The passage mainly discusses ________.
A. the experiments on the common cold
B. the fallacy about the common cold?
C. the reason and the way people catch colds
D. the continued spread of common colds
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