题目
题型:云南省期中题难度:来源:
black holes! Astronomers last week discovered a pair of enormous black holes far out in the galaxy
that appear to be dancing toward each other. However, astronomers say the collision is not likely
to occur for several million years.
Black holes are objects in outer space that are so dense that nothing can escape their gravity.
They often sit in the center of a galaxy - like the Milky Way - and suck up everything near them.
The gravitational pull of a black hole is so intense that not even light (Which travels faster than
anything else in space) can make it past without being swallowed.
Black holes, like the one at the center of the Milky Way, are enormous. Scientists call some
of them "supermassive", because they can be a few million times the size of most stars. Their size,
their mass, and their inescapable gravity make black holes a giant force of nature in outer space.
Because there is no light near black holes, astronomers cannot actually see them; they are
completely invisible to us on the Earth. Scientists manage to detect the existence of a black hole
by watching what happens to other objects, or matter floating in space.
So how did scientists manage to get a good look at a region so faraway? The team used an
orbiting NASA observatory known as Chandra. This special observatory uses X-rays rather than
light to watch far out into space. Right before a star gets sucked into a black hole, it produces a large
number of X-rays.
B. It has extremely strong gravity.
C. It can suck up everything near them.
D. It is an enormous object in the galaxy.
B. Because Chandra can help them see black holes in X-rays.
C. Because Chandra was sucked into the black hole.
D. Because Chandra can resist the gravitational pull of a black hole.
B. How stars react when sucked into a black hole.
C. Black holes" swallowing up many nearby stars.
D. How black holes come into existence.
B. The location of black holes in the galaxy.
C. New clues about the beginning of the universe.
D. Nothing near a black hole can escape without being swallowed.
答案
核心考点
试题【阅读理解。 What looks like a black hole, behaves like a black hole, but is bigger】;主要考察你对题材分类等知识点的理解。[详细]
举一反三
为多余选项。
Six Ways to Improve Reading Comprehension
Help your child keep what he reads --- a crucial skill, especially as he gets older and needs to
gain important information from textbooks.
Let him read aloud.
This forces him to go slower, which gives him more time to process what he reads. 1
Provide the right kinds of books.
2 He should recognize at least 90 percent of the words without any help. Stopping to figure
out a word makes it tough for him to focus on the overall meaning of the story.
3 To gain meaning from text, your child needs to read quickly and smoothly- a skill known
as fluency. Rereading familiar, simple books gives your child practice at decoding words quickly,
so he"ll become more fluent.
Talk to the teacher.
If your child is struggling strongly with comprehension, he may need more help with his reading-for
example, building his vocabulary or practicing phonics skills.
Supplement class reading.
If his class is studying a particular theme, look for easy-to-read books or magazines on the topic
. Some previous knowledge will help him get better prepared and make his way through tougher
classroom texts.
Talk about what he"s reading.
This "talking processing" helps him remember and think through the themes of the book. 4 . For
example:
Before: "What interests you in this book?"
During: " 5 . Is it turning out the way you thought it would?"
After: "Can you summarize the book? What did you like about it?"
A. Reread to build fluency.
B. Plus, he"s not only seeing the words, he"s hearing them, too.
C. What"s going on in the book?
D. Do you know all the characters" names in the story?
E. Make sure your child gets lots of practice of reading books that aren"t too hard.
F. He should recognize at least 90 percent of the words without any help.
G. Ask questions before, during, and after a reading session.
●Some scientists claim that we humans are the only living things that are conscious(有意识的)-we
alone are aware that we are thinking.
●No one knows ho w consciousness works-it is one of science"s last great mysteries.
●A11 your thoughts take place in the cerebrum (大脑皮质), which is at the top of your brain, and
different kinds of thoughts are linked to different areas, called association areas.
●Each half of the cerebrum has four rounded ends called lobes (脑叶)-two at the front (frontal and
temporal lobes) and two at the back (occipital and parietal lobes).
●The frontal lobe is linked to your personality and it is where you have your bright ideas.
●The temporal lobe is where you hear and understand what people say to you.
●The occipital lobe is where you work out what your eyes see.
●The parietal lobe is where you record touch, heat and cold, and pain.
●The left half of the brain controls the right side of the body. The right half controls the left side.
●One half of the brain is always dominant (in charge).
Usually, the left brain is dominant ,which is why 90 % of people are right-handed.
B. The temporal lobe.
C. The occipital lobe.
D. The parietal lobe.
B. Bright ideas come from the parietal lobe.
C. The occipital and temporal lobes are at the back of the cerebrum.
D. The occipital lobe is in charge of sound.
B. their temporal lobe is usually dominant
C. their right brain is usually dominant
D. their left brain is usually dominant
you were to try to learn how to write Chinese characters, you would find that they are not nearly as
difficult as you may have imagined. And they certainly qualify as forming one of the most attractive,
beautiful, logical(合乎逻辑的), and scientifically constructed(构造) writing systems in the world. Each
stroke(笔画)has its own special significance. If you are familiar with the rules of Chinese characters, you
will find it very easy to remember even the most complicated looking character, and never miss a stroke.
The earliest known examples of Chinese written characters in their developed form are carved into
tortoise shells and ox bones. The majority of these characters are pictographs. Archaeologists of various
countries have learned that most early writing systems went through a pictographic stage, as did the
Egyptian hieroglyphics. Most writing systems, however, eventually developed a phonetic(表示语音的)
alphabet to represent the sounds of spoken language rather than visual images observed in the physical
world.
One notable feature of Chinese characters is the "radical." "Radical" in English means "root". For
example, the characters yu "language," shuo "talk," i "discuss," "opinion," and lun "discuss" all share the
yen radical, which means "language," and gives the reader a clue to the meaning of the character as a
whole. The characters hsiu "rotten," shan "cedar," " t"ao "peach," and lin "forest," all contain the mu
"wood" or "tree" radical, indicating one of their shared key characteristics. If you know the radical of a
character, you can usually get a general idea of the meaning of the character it is a part of. Although there
is a theoretical total of almost 50,000 written Chinese characters, only about 5,000 of these are frequently used; and the total number of radicals is only 214. So learning to read and write Chinese is not nearly so
formidable a task as it may at first seem.
B. as difficult as you may have imagined
C. difficult to remember
D. scientifically constructed
B. Some strokes are more important than others.
C. There are rules in forming the Chinese characters.
D. Some writing systems eventually developed a phonetic alphabet.
B. the strokes of the Chinese characters
C. pictographs
D. the radical of the Chinese characters
usually found in the African rain forest, suddenly turns up in children in the American Midwest, it"s hard
not to wonder if the disease that comes from foreign animals is homing in on human beings. "Most of the
infections(感染) we think of as human infections started in other animals, "says Stephen Morse, director
of the Center for Public Health Preparedness at Columbia University.
It"s not just that we"re going to where the animals are; we"re also bringing them closer to us. Popular
foreign pets have brought a whole new disease to this country. A strange illness killed Isaksen"s pets, and
she now thinks that keeping foreign pets is a bad idea. "I don"t think it"s fair to have them as pets when we have such a limited knowledge of them, "says Isaksen.
"Laws allowing these animals to be brought in from deep forest areas without stricter control need
changing," says Peter Schantz. Monkey-pox may be the wake-up call. Researchers believe infected
animals may infect their owners. We know very little about these new diseases. A new bug(病毒) may
be kind at first. But it may develop into something harmful(有害的).
Monkey-pox doesn"t look a major infectious disease. But it is not impossible to pass the disease from
person to person.
B. prevent us from being infected
C. enjoy being with children
D. suffer from monkey-pox
B. We need to study native animals.
C. They can"t live out of the rain forest.
D. We do not know much about them yet.
B. a clear warning
C. a dangerous animal
D. a morning call
B. may easily get infected by diseases from dogs
C. should not be allowed to have pets
D. should .stop buying pets from Africa
根据短文内容,从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。
nations. They say people should eat more of the same kind of food eaten by humans living more than
10,000 years ago. 1
The scientists say that the human life has changed greatly. Our bodies have not been able to deal
with these changes in lifestyle and this had led to new kinds of sicknesses. 2 So they are called
"diseases of civilization". Many cancers and diseases of the blood system are examples of such
diseases.
Scientists noted that people in both the Old Stone Age and the New Stone Age enjoyed very
little alcohol or tobacco, probably none. 3 However, a change in food is one of the main differences
between life in ancient times and that of today.
Stone Age people hunted wild animals for their meat, which had much less fat than domestic ones.
They ate a lot of fresh wild vegetables and fruits. They did not have milk or any other dairy products,
and they made very little use of grains. 4 We eat six times more salt than our ancestors. We eat
more sugar. We eat twice as much fat but only one third as much protein and much less vitamin C.
5 But scientists say that we would be much healthier if we eat much the same way the ancient
people did, cutting the amount of fatty, salty and sweet food.
A. Stone Age people lived a simple life.
B. But today, we enjoy eating a lot of these.
C. In that case, they would live much healthier.
D. Ancient people also got lots of physical exercise.
E. These new sicknesses were not known in ancient times.
F. People today probably don"t want to live like our ancestors.
G. Modern people used to suffer from "diseases of civilization".
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