D As they migrate（迁移），butterflies and moths choose the winds they want to fly wi

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D
As they migrate（迁移），butterflies and moths choose the winds they want to fly with，and they change their body positions if they start floating in the wrong direction．This new finding suggests that insects may employ some of the same methods that birds use for traveling long distances．Scientists have long thought that insects were simply at the mercy of the wind．
Fascinating as their skills of flight are，migrating behavior has been difficult to study in insects because many long distant trips happthousands of feet above ground．Only recently have scientists developed technologies that can detect such little creatures at such great heights．
To their surprise，though，the insects weren’t passive travelers on the winds．In autumn，for example，most light winds blew from the east，but the insects somehow sought out ones that carried them south and they positioned themselves to navigate directly to their wintering homes．
Even in the spring，when most winds flowed northward，the insects didn’t always go with the flow．If breezes weren’t blowing in the exact direction they wanted to go，the insects changed their body positions to compensate．Many migrating birds do the same thing．
The study also found，butterflies and moths actively flew within the air streams that pushed them along．By adding flight speeds to wind speeds，the scientists calculated that butterflies and moths can travel as fast as 100 kilometers an hour．The findings may have real-world applications．With climate warming，migrating insects are growing in number．Knowing how and when these pests move could help when farmers decide when to spray their crops．
71．What’s the main idea of the text?
A．Insects migrate with the seasons．     B．Wind helps insects greatly in migrating．
C．Windsurfing insects have real direction．D．Scientists have trouble in observing insects．
72．Scientists originally thought that____________．
A．insects always waited for their favourable winds
B．insects chose the winds they wanted to ride
C．insects were just blown about by the wind
D．insects positioned themselves in the winds
73．It is not easy to stuay the migrating behavior of the insects because____________
A．the little creatures can fly very fast     B．they have no regular migrating courses
C．the wind’s direction is hard to foresee    D．their flight is long and high above ground
74．We can learn from the text that______________.
A．insects fly in the way birds do
B．insects travel more easily in autumn
C．insects never position themselves when flying low
D．insects rest a lot when the wind pushes them along
75．According to the passage，the findings can              ．
A．increase insects in number         B．instruct farmers when to spray
C．prevent climate warming       D．help protect insects

答案

71—75CCDAB

解析

略

举一反三

D
A team of scientists proved that seals had a very good sense of hearing. These men trained blind seals to expect food when they heard sounds. The seals always began snapping(猛咬) when a strong signal was sounded.
It was proved that even a soft signal, a considerable distance away, could make these sea animals respond. That should make the fisherman who makes much noise while working, or talks loudly, start thinking.
The same team of scientists also trained seals to recognize different sounds. One bell-tone meant food ,two bell-tones meant no food. In the beginning, the seals made mistakes when the two bell-tones were sounded. They were given a light tap after each mistake. The seals were good learners. They easily learned to tell the difference between the sounds.
67.Why was it necessary to use blind seals? Because they______.
A. were unable to use sight for clues    B. had better hearing
C. were waiting to be fed             D. were the only animals to be found
68. To those seals strong signal meant_____.
A. snapping     B. nothing      C. food       D. a light tap
69. The article doesn’t say directly but suggests that fishermen usually think______.
A. seals have no good sense of hearing   B. seals have good sense of hearing
C. seals can only recognize bell sounds   D. seals can not hear soft or long distant sounds
70. Which title will be the best to suit the article?
A. Clever Seals                      B. Smart Learners
C. An Underwater School             D. An Unknown School

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B
The following are the results of the tests done by “Family and Home Magazine” on some Pocket Tape-Recorders on the market now.
Pearlcorder S702 $64
This simple model at the bottom of the Olympus range scored the most points for its excellent quality of recording. Background noise hardly affects the sound and recording from a pocket is perfectly possible, but it doesn’t turn off automatically.
Tape length: 30minutes per side. Weight: 240g.
Sony M9   $49.95
Small and very good looking, Sony’s latest offering scored most for its appearance. Sounds clear, but there is slight machine noise. The big control buttons are a great improvement on some of the complicated little controls on other tape-recorders. It doesn’t switch off automatically, but a red light shows if the machine is still running.
Tape length: 60minutes per side. Weight: 195g.
Sony M400 $115
Lots of little control buttons that make a noise are difficult to use. Recording is good but machine noise loses points. Tape counter and automatic switch-off when tape has finished recording or rewinding are useful.
Tape length: 60 minutes per side. Weight: 230g.
Imperial OEM MC7 $ 29.95
Cheap and simple compared with the rest, but recording is good as long as there is no background noise. Use only its own-make of cassette. No light to show it is on; no fast-forward button and the record button makes a loud noise.
Tape length: 30 minutes per side. Weight: 285g.
Philips 585 $80
Handsome and simple to use, but recording is very poor at more than the recommended distance of 5 cm-designed for dictation. No recording light.
Tape length: 15 minutes per side. Weight: 220g.
46. The machine that produces the best recording with the least unwanted noise is __.
A. Pearlcorder S 702     B. Sony M9
C. Sony M400          D. Imperial OEM MC7
47. If you want a machine which turns off automatically and weighs very little you should choose _____.
A. Pearlcorder S 702   B. Sony M9 C. Sony M400 D. Philips 585
48. Which of the following allows you to record longest but costs you least?
A. Philips 585   B. Imperial OEM MC7 C. Sony M400   D. Sony M9

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C
The computer is fast, and never makes a mistake, while people are too slow, and full of mistakes sometimes. That’s what people often say when they talk about computers. For over a quarter of a century, scientists have been making better and better computers. Now a computer can do a lot of everyday jobs wonderfully. It is widely used in factories, hospitals, post office and airports. A computer can report, decide and control in almost every field. Many computer scientists are now thinking of making the computer “think” like a man. With the help of a person, a computer can draw pictures, write music, talk with people, play chess, recognize voice, translate languages and so on. Perhaps computer will one day really think and feel. Do you think the people will be afraid when they find that the computer too clever to listen to and serve the people?
63. A computer is clever because people are _____
A. clever    B. not clever   C. slow  D.making mistakes
64. Which of the following can computers not do now?
A. Draw pictures   B. Talk    C. Invent new things    D.Serve the people
65. What will happen in the future?
A. Most work will be done by the computer.     B. People will no longer use computer.
C. Computers will be used only talk with people.   D. All computers will be put into prison.
66. The passage is written to __________.
A. warn people of the danger of the computer
B. tell people about the computer
C. tell people about computer scientists
D. show how to use the computer
67. The best title for this passage is _________.
A. “Computers”        B. “Computer Scientists”
C. “The Future World”   D. “Talk With Computers”

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D
Earth is the third planet from the sun. It is one of the four inner planets. The other three inner planets are Mercury, Venus, and Mars. The inner planets are also called the rocky planets, because th

ey are made of rocks.
Earth is often called the “Water Planet”, because it is the only planet in our solar system which has liquid water on its surface. About 70% of the surface of Earth is covered by water! The other part of Earth is made up of continents and islands which have different landforms on them. Examples of landforms are mountains and plains. Plants and animals can live on Earth, because it has so much water.
Earth spins very quickly compared to other planets. It only takes Earth 24 hours to spin around its axis one time. One Earth day is 24 hours long! Earth orbits the sun in 365 days! This makes one Earth year 365 days long!
Earth is the only planet in our solar system where humans, other animals, and plants can live. There is plenty of water to drink or to live in. Water is present on Earth in its big oceans and in the air! Clouds are made of water vapor. The atmosphere has a lot of oxygen in it for animals to breathe, but the rest of our “air” is made up of water vapor, nitrogen, carbon dioxide, and other gases. The air is perfect for plants to grow. Earth temperature is not the same in all places, but the temperature is just right for plants, animals, and humans in most places on Earth.
Like the other inner planets, Earth has volcanoes. Volcanoes on Earth are different from those on other planets, because they still erupt. Scientists think that there may be active volcanoes on other planets and moons in our solar system, but they are still studying this.
Earth has one planet which we call the Moon. The surface of the Moon has many craters on it These were caused when meteorites hit it. It has many volcanoes on it which do not erupt anymore. We can see the moon at night without using a telescope. It is the closest space object to our planet ,Earth.
68.Earth is called the Water Planet,______.
A. because animals need water         B. the water makes it look blue from space
C. it has liquid water on its surface      D. Earth is the third planet from the sun
69. It takes Earth ______to orbit the sun in one year.
A.24 hours                   B.24 days                     C.365 days                   D.360 days
70. Life exists on Earth,______.
A. because the water, air, and temperature are just right
B. there is water vapor in clouds
C. Earth is the planet closest to the sun
D. earth has volcanoes
71.The craters on the moon were caused by______.
A. meteorites hitting its surface              B. active volcanoes
C. volcanoes which do not erupt anymore      D. some reasons that are not mentioned

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C
Geniuses amaze us, impress us and make us all a little jealous．How do they differ from the average person? Scientists are working hard to figure out that answer．Tune in to the National Geographic Channel to find out about the discoveries they’re making in the series My Brilliant Brain.
When Marc Yu was only two years old, he began to play the piano．After a year, he started learning pieces by Beethoven．Now he’s a world-famous concert pianist at age eight．He learns newer and more difficult pieces with ease and can identify any note he hears．He seems to be specially designed for music．In Born Genius, National Geographic looks at the science behind child prodigies (神童) to explain why some children seem to be born without limits.
Genius didn’t come naturally to Tommy McHugh．His came only after he nearly died from bleeding in his brain．After recovering, McHugh’s head was filled with new thoughts and pictures．So, he began to express them in the form of poetry and art．Now, he’s a seemingly unstoppable creative machine．Sufferers of autism and brain injury have shown that great mental ability can sometimes come from damage or disease．Accidental Genius explores this puzzling relationship.
Can normal people be trained to be geniuses? Susan Polger has shown no signs of extraordinary intelligence．Yet, during her childhood, she studied thousands of chess patterns and learned to recognize them immediately．As a result, she was able to beat skilled adult players by age 10 and can now play up to five games at the same time without even seeing the boards．Make Me a Genius examines what it takes to turn an ordinary brain into that of a genius.
If becoming a genius were easy, we’d all be one．Yet, there is much more to super intelligence than simply being born lucky．Learn more about amazing brains this month on National Geographic’s My Brilliant Brain.
51．My Brilliant Brains is most probably from _______.
A．a website B．the radio C．a magazine D．a newspaper
52．The author takes Marc Yu as an example to show that a child prodigy is .
A．a person who learns something easily
B．a child who is eager to learn new things
C．a student who practices an instrument a lot
D．a kid who works hard to do well in school
53．Which of the following is NOT true according to the passage?
A．New things about the brain are still being discovered.
B．People without natural abilities can learn to do things well.
C．Some people naturally have more active brains.
D．People are usually smarter when they recover from brain injury.
54．From the passage, we know that ___________
A．scientists completely understand the brain
B．people can only be born as geniuses
C．there’s no such thing as a true genius
D．there are many factors in being a genius
55．The author develops the passage mainly by ___________.
A．providing typical examples
B．following the natural time order
C．presenting a cause and analyzing its effects
D．comparing opinions from different scientists

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