根据短文内容, 从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Envy the kids at school who are smarter than you and seem to learn more quickly? Don’t worry.   71 

  72  However, according to a recent study, IQ can rise—not just by one or two points, but by as many as 21 points!

Scientists have found that IQ changes are linked to changes in part of the brain called gray matter, which was seen to grow and become denser (更加密集) in the brains of people whose IQs improved greatly.

  73  One is to train your short-term memory.Previous research has proven that short-term memory is the basis for intelligence, so trying to recognize or retell something that you have seen or heard can help raise your overall brain power.   74    

A good night’s sleep will also help improve your concentration.   75  It helps you stay focused for longer the next day.

Scientists have also found that exercise helps.Walking 30 minutes a day five times a week and doing exercise will help you become more knowledgeable—as well as healthier and fitter.

A. There are several ways of increasing your brain’s gray matter.

B. Your brain deals more efficiently with things you truly like.

C. With a bit of brain training, the chances are that you can be as smart as they are.

D. So maybe it’s a good idea to get your brain in training right away.

E. Getting enough sleep is like pushing the reset button in your brain.

F. The more you work on it, the better you will become.
G. People used to assume that a person’s IQ was unchangeable

How would you like to sleep with one half your brain asleep and the other half awake? Dolphins sleep this way. Recently, scientists at Indiana State University have discovered that ducks sleep this way too. They found that ducks sleep half awake so they can rest and watch for danger at the same time.

After putting their ducks in a row and videotaping them, some researchers found ducks on the end of each row spent more time asleep with one eye open, apparently looking for predators.

“The more the ducks felt threatened, the more they slept with one eye open,” said lead author Niels C. Rattenborg, a graduate student at Indiana State University,Terre Haute. “The unique aspect is not that they do it, but that they control it. When they sleep at the edge of a group, they tend to realize greater danger, so they spend more time sleeping with one half of their brain.” Ducks with one eye open were still awake enough to detect predators, said the authors of the study, which appears today in the journal Nature.

The researchers studied four groups of four ducks held in plastic boxes, which were arranged in a row. Ducks on the end were found to sleep with one eye open 31.8 per cent of the time, compared to 12.4 percent of the time for ducks in the central position.

Also, ducks in the central position did not open one eye more than the others, while ducks on each end kept the eye facing away from the group open 86.2 per cent of the time. Brain wave readings of the ducks showed that the half of the brain receiving signals from the closed eye indicated that half of the brain was sleeping. Signals from the half of the brain receiving signals from the open eye showed a state between fully awake and asleep.

67. It was discovered that      .

A. most people would like to be half asleep B. ducks can sleep half awake

C. dolphins sleep on their way                   D. ducks have different sleeping habits from each other

68. The under lined word “predator” is most likely to mean       .

A. an animal that hunts, kills and eats other animals

B. a human being who looks after and feeds ducks

C. a scientist who does research work on animals

D. an animal that is likely to be friends with ducks       

69. Ducks at the end of each row sleep with one eye open because       .

A. they are looking for food                 B. they want to enjoy the scenery

C. they are watching out for danger     D. they are unique in their sleeping habit       

70. Which of the following is true according to the passage?

A. Ducks on the northern end of a row would keep their eye facing the south open.

B. Ducks with less sense of duty usually choose to stay in the center of a row.

C. Ducks with one eye open at the edge can still enjoy a certain degree of sleep.

D. A video tape recorder was the only electronic device used in the experiment.     

 Do you still remember the interesting question: why did the chicken cross the road? To get to the other side.

    Most people know this joke. But recently, some people have been much more concerned with how the grizzly bear and mountain lion can cross the road.

    Millions of animals die each year on US roads, the Federal Highway Administration reports. In fact, only about 80 ocelots, an endangered wild cat exist in the US today. The main reason? Road kill.

   “Ecopassages” may help animals cross the road without being hit by cars. They are paths both over and under roads. "These ecopassages can be extremely useful, so that wildlife can avoid human conflicts," said Jodi Hilty of the Wildlife Conservation Society.

But do animals actually use the ecopassages? The answer is yes. Paul Beier of Northern Arizona University found foot marks left by mountain lions on an ecopassage that went under a highway. This showed that the lion used the passage.

  Builders of some ecopassages try to make them look like a natural part of an area by planting trees on and around them. Animals seem to be catching on. Animals as different as salamanders and grizzly bears are using the bridges and underpasses.

  The next time you visit a park or drive through an area with a lot of wildlife, look around.

You might see an animal overpass!

63.The writer uses the example of "ocelots" to show that __________.

A. wild animals have become more dangerous

B. the driving conditions have improved greatly

C. the measure for protecting wildlife fails to work

D. an increasing number of animals are killed in road accidents

64. From the news story, we know an ecopassage is __________ .

A. an underground path for cars                        B. a fence built for the safety of the area

C. a bridge for animals to get over a river            D. a pass for animals to cross the road

64.When the writer says that animals seem "to be catching on", he means _______.

A. animals begin to realize the danger on the road

B. animals begin to learn to use ecopassages

C. animals are crossing the road in groups

D. animals are increasing in number

66.The writer asks visitors and drivers to look around when traveling because            .

A. wild animals may attack cars

B. wild animals may jam the road

C. they may see wild animals in the park

D. they may see wild animals on ecopassages

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