阅读理解。 The surprising experiment I am about to describe proves that air is al
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| 阅读理解。 |
The surprising experiment I am about to describe proves that air is all around you and that it proves down
upon you. Air pressure is a wonderful force. When you swim underwater, you can feel water push down
your body. The air all around you does the same. However, your body is so used to it that you do not notice
this. The pressure is caused by a layer of air called the atmosphere. This layer surrounds the Earth, extending
to about five kilometers above the Earth"s surface.
The following experiment is an easy one that you can do at home. But make sure that you are supervised,
because you will need to use matches. Now for the experiment!
What you need
·A hard-boiled egg without the shell
·A bottle with a neck slightly smaller than the egg
·A piece of paper
·A match
Method
1) Check that the paper will sit firmly on the neck of the bottle.
2) Tear the paper into strips and put the strips into the bottle.
3) Light the paper by dropping a burning match into the bottle.
4) Quickly sit the egg on the neck of the bottle.
Result
Astonishingly, the egg will be sucked into the bottle. Your friends will be amazed when you show them
the experiment. But be careful when you handle matches.
Why it happened
As the paper burns, it needs oxygen and uses up the oxygen (air) in the bottle. The egg acts as a seal in
the neck of the bottle, so no more air can get inside. This reduces the air pressure inside the bottle. The air
pressure must equalize, so more air from outside must enter the bottle. The outside air pressure against the
egg and then the egg is pushed into the bottle! This proves that air is all around and that it is pressing down
on it. |
| 1. Why is there the need to take care when you are doing the experiment? |
A. The bottle could break.
B. You need to light the paper with a match.
C. The egg needs to be shelled.
D. The egg has to be perfectly placed on the neck of the bottle. |
| 2. In the experiment, the burning inside the bottle can _____. |
A. equalize the air pressure inside and outside
B. make a seal in the neck of the bottle
C. finish up the oxygen inside the bottle
D. produce more oxygen inside the bottle |
| 3. How did the egg put into the bottle? |
A. The oxygen inside the bottle sucked the egg in.
B. It became salt without the shell.
C. The neck of the bottle was wide enough.
D. The outside air pressure forced it into the bottle. |
| 4. The experiment is carried cut to prove _____. |
A. water pushes on your body when you swim underwater.
B. the earth is surrounded by a layer of air called the atmosphere.
C. the pressure of air around us has a powerful force.
D. the air pressure is not equalized around us. |
答案
| 1-4: BCDC |
举一反三
| 阅读理解。 |
A volcanic eruption in Iceland has sent ash across northern Europe. Airlines have stopped or changed the
flights across the Atlantic Ocean, leaving hundreds of passengers stuck in airports.
Grirmsvom is one of the largest and most active volcanoes in Europe. What makes Grimsvom different
is that it lies under a huge glacier (冰川) of ice up to 12 maters thick. The hot volcano heats up the ice above
it, which then forms a layer (层) of water between the glacier and the volcano. This layer of water puts
pressure on the volcano, keeping it stable. As the water flows out from under the glacier, the pressure lifts.
The lava (岩浆) from the volcano then comes up to the surface. This is exactly what happened today.
Now, airlines have to make changes to their flights so as not to fly through the clouds of volcanic ash.
According to KLM. one of Europe"s biggest airlines, airplanes cannot go under the cloud or over it. Going
through the cloud can result in ash getting stuck in the airplane"s engines, causing damage to the plane.
The eruption has also caused problems for animals in Iceland. The volcano left ash and sharp. Glass-like
rocks all over the countryside. Farmers are keeping their animals inside to stop them from eating ash-covered
grass to the sharp object. |
| 1. What makes Grimsvom different from other volcanoes? |
A. It is below ice
B. It lies under the sea
C. It is the largest volcano
D. It is lava affects the airlines |
| 2. What keeps Grimsvotn still? |
A. The slow flow of water
B. The low water temperature
C. The thick glacier
D. The water pressure |
| 3. Which of the following is the result of the volcanic eruption? |
A. People stop traveling in Europe
B. Airlines suffer from the loss of planes
C. It becomes dangerous for animals to eat outside
D. Farmers have lost many of their animals |
| 4. This text is most probably taken from _____. |
A. a research paper
B. a newspaper report
C. a class presentation
D. a geography textbook. |
| 阅读理解。 |
Howling is a behavior commonly observed among a wolf pack. As pack animals, wolves work together
to hunt and rely on howling as an important means of communication among each other. There are different
explanations of a wolf"s howl and it appears that there may be more to discover.
One theory is that wolves howl to bond better together. It"s almost as if howling together helps the pack
stay together. Perhaps something is similar to people feeling a sense of involvement with each other when
singing a song together. But this theory may be wrong, explains Fred H. Harington, a professor who studies
wolf behavior.
Indeed, there have been times when wolves have been seen one moment howling in a chorus, and the
next, quarreling among each other. It appears that usually the lowest-ranking members of the pack may
actually be "punished" for joining in the chorus at times. So is howling a way to strengthen a social bond or
just a way to reconfirm status among its members? - Why do wolves howl for sure?
What is clear, however, is that howling is often used among packmates to locate each other. Hunting
grounds are distant and it happens that wolves may separate from one another at times. When this happens,
howling appears to be an excellent means of gathering.
Howling, interestingly, is a contagious behavior. When one wolf starts to howl, very likely others will
follow. This is often seen to occur in the morning, as if wolves were doing some sort of "roll call" where
wolves all howl together to report their presence. |
| 1. What the possible similarity between wolves" howling together and human"s singing in chorus? |
A. The act of calling each other.
B. the sense of accomplishment.
C. The act of hunting for something.
D. The sense of belonging to a group. |
| 2. Why does Harrington think the "social bond" theory may be wrong? |
A. Wolves separate from each other after howling.
B. Wolves tend to protect their hunting grounds.
C. Wolves sometimes have quarrels after howling together.
D. Wolves of low rank are encouraged to join in the chorus. |
| 3. Researchers are sure that wolves often howl to _____. |
A. show their ranks
B. find their companions
C. report the missing ones
D. express their loneliness |
| 4. "Howling… is a contagious behavior" (in the last paragraph) means _____. |
A. howling is a signal for hunting
B. howling is a way of communication
C. howling often occurs in the morning
D. howling spreads from one to another |
| Directions: Complete the following passage by filling in each black with one word that best fits the context. |
Does going to college really 1_____ English class in college on the short story. Our first assignment was
to read 2_____ short stories and then discuss which one was better. After reading both, I wasn"t sure. Over
the 3_____ several months, my professor taught me 4_____ one story was so much better than the other.
5_____ was rich in mclaphor (隐喻) and character development, while the other was humorous 6_____ too
shallow. I couldn"t see this at first. Yet, in a few months, my brain got reeducated and 7_____ could see the
difference between good and bad writing and could appreciate literature at a whole new level.
Going to college helps build a strong mind, which leads 8_____ greater success in one"s life. |
| Reading comprehension. |
A recent study of ancient and modern elephant has come up with the unexpected conclusion that the
African elephant is divided into two distinct (不同的) species.
The discovery was made by researchers at York and Harvard University when they were examing the
genetic relationship between the ancient woolly mammoth and mastodon modern elephants-the Asian
elepphant, African forest elephant, and African savanna elephant.
Once they obastain DNA sequences (序列) from two fossils (化石), mammoths and mastodons, the
team comparted them with DNA from modern elephants. They found their amazement that mordern forest
and savanna elephants are as distinct from each other as Asian elephants and mammoths.
The scientists used detailed genetic analysis to prove that the African savanna elephant and the African
forest elephant have been distinct species for several million years. The divergence of the two species took
place around the time of the divergence of Asian elephants and woolly mammoths. This result amazed all
the scientists.
There has long been debate in the scientific community that the two might be separate species, but this
is the most convincing scientific evidence so far that they are indeed different species.
Previously, many naturalists believed that African savanna elephants and African forest elephants were
two populationgs of the same species, despite the elephants" significant size differences. The savanna elephant
has an average shoulder height of 3.5 metres while the forest elephant has an averate shoulder double the
weight of the forest elephant. But the fact that they look so differrent does not neccssarily mean they are
different species. However, the proof lay in the analysis of the DNA.
Alfried Roca, assitant professor in the Department of Animal Sciences at t he University of Illinois, said,
"We now have to treat the forest and savanna elephants as two difficult units for conservation purpose.
Since 1950, all Afican elephants have been conserved as one species. Now that we know the forest and
savanna elephants have been distinct animals, the forest elephant should become a bigger priority (优先) for
conservation purposes." |
| 1. One of the fossiles studied by the researchers is that of _____. |
A. the Asian elephant
B. the forest elephant
C. the savanna elephant
D. the maslodon elephant |
| 2. The underlined word "divergence" in Paragraph 4 means "_____". |
A. evolution
B. exhibition
C. separation
D. examination |
| 3. The researchers" conclusion was based on a study of the African elephant"s _____. |
A. DNA
B. height
C. weight
D. population |
| 4. What are Alfred Roca"s words mainly about? |
A. The conservation of Afican elephant
B. The purpose of studying Afican elephant
C. The way to divide Afican elephants into two units
D. The renson for the distinction of African elephants |
| 5. Which of the following can be the best tille for the passage? |
A. Naturalist" Beliefs about Elephants
B. Amazing Experiments about Elephants
C. An Unexpected Finding ahout Elephants
D. A Long Scientifif Debate about Elephants |
Directions: Read the following passage. Fill in the numbered blanks by using the information from the passage.
Write NO MORE THAN THREE WORDS for each answer. |
A person searches various websites for different reasons, such as school, work, or entertaiment. For
teenagers, many information resousces on the Internet can be used. As a matter of fact, there are educational,
music and art websites that are truly helpful to teeagers, because they can help make one"s life easier.
Education websites are helpful to a teenager in doing school work and searching for a colleag. Some can
help studying for testes, explaining a lesson, and doing homeward.Some can help find the right school based
on one"s interests. And still others have pages devoted to the social life at each colleges or the species activities
that at a certain school. Some free music sites enable a teenager to diversify their musical_ tastes. On these
sites, all types of music are available such as pop, jazz and country. One can type in a song,category or artist
and his or her entire catalog appears. Then the listener can make multiple play lists without creating an account
(账户) with the site. There various art websites that can help students to appreciate and create art pieces. On
these sites, a student can view numerous photos and art pieces from different. Mediums or create an account
with the website to upload their art pieces for people to see. In addition, one can enjoy various art people have
created on display for the rest of the world.Truly informative resources offered on the Internet. The best
suggestion one can receive is to try to look for new websites that can help in the educational,music, or art area
so one can become well-rounded and informed. |
Truly Helpful Websites for Teenagers
Many 1______ are available on various websites.
I. Educational sites: helping one 2______ and search for a college
· Study for tests, explain a lesson, and do homework
· Find the right school that one 3______
· learn information about college social life and 4______
II. Free music sites; 5______ to diversify musical tastes
· Listen to all types of music
· Type in a song, category, or artist to get an entire catalog
· make multiple playlists 6______
III. 7______; helping one appreciate and create works
· View photos and works from mediums
· 8______ for others to see
· 9______ on display
Helpful websites can make teenagers 10______ |
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