阅读理解 It"s true that teens don"t get enough sleep, but changing the school s

题型：同步题难度：来源：

阅读理解      It"s true that teens don"t get enough sleep, but changing the school starting time would have a chaotic_
effect and throw everyone off balance.
      Scientists have shown that teens are more active later at night than children and adults, so most teens
are probably staying up later for whatever reasons."The researchers measured the presence of the
sleeppromoting hormone (荷尔蒙) in teenagers" saliva (唾液) at different time of the day.They learned
that the hormone levels rise later at night than they do in children and adults-and remain at a higher level
later in the morning.Measuring the hormone in the saliva is a good way to show that most teens have
sleep problems, but changing school schedules isn"t the best way to fix this.Most people arguing against
changing school schedules would say that it would only cause teens to stay up and wake up later, thus
leaving them with the same problem.
     The biggest problem schools would come across from changing their schedules would be the after
school and job conflicts students and teachers would meet."Teachers reported that students were more
alert, and research showed that afterschool sports and jobs would suffer.Students in that area might have
been able to deal with less time for jobs and sports somehow, but some of them have practice and earlier plans that would become conflicted if this change were to occur.Most students rarely have time to play a
sport and do homework before 9 or 10 o"clock.Opening schools later may have worked for some areas,
but the reality is often very different.

1. The meaning of the underlined word "chaotic"in the 1st paragraph is close to________.

A. positive
B. apparent
C. negative
D. ambiguous

2. Most teens have sleep problems because________.

A. they are more active than children and adults
B. school work takes up most of their time
C. their hormone levels are higher later at night
D. they probably like staying up for no reason

3. Which of the following is TRUE according to the passage?

A. There are many conflicts between students and teachers.
B. Some of the teachers have practice and earlier plans.
C. Most students are able to do sport and homework before 9?00.
D. Ways to solve students" sleep problem vary from area to area.

4. The passage mainly develops by________.

A. giving reasons
B. showing examples
C. comparing facts
D. offering solutions

答案

1-4: CCDA

举一反三

     The over 55s who grew up watching blackandwhite programs and films are more likely to dream in
grey, research suggests.
     And the under 25s who have watched color TV all their lives tend to have colorful adventures in_the_
land_of_nod.
     Research from the first half of the 20th century, especially in the 1930s and 1950s, suggested that most dreams are in black and white.
     But results from tests in the 1960s and later suggested that up to 80 per cent of dreams contain some
colors.
     Since this period marked the transition  (过渡) from blackandwhite films and TV to widespread
Technicolor (彩色印片法), an obvious explanation was that television was influencing dreams, but
differences  between  the  studies  prevented  the researchers from drawing any firm conclusions.
     Later studies asked subjects  (实验对象)  to complete dream diaries immediately they woke up, but
the  earlier  research  used  questionnaires completed in the middle of the day, so the subjects might have
simply forgotten color elements in their dreams and assumed they were grey.
     To solve the problem, psychologist Eva Murzyn asked 60 subjects, half of whom were under 25 and
half over 55, to answer a questionnaire on the color of their dreams and their childhood exposure (暴露)
to films and TV.
     The subjects then recorded different aspects of their dreams in a diary every morning.
     She found there was no significant difference between results drawn from the questionnaires and the
dream diaries.
     She then analyzed data to find out whether an early exposure to blackandwhite TV or films could still
have a lasting effect on her subjects"dreams,40 years later.
Less than five per cent of the under25s"dreams were black and white.But the over55s who had access to
blackandwhite media in their younger days reported dreaming in black and white roughly a quarter of the
time.
     Murzyn said, "There could be a critical period in our childhood when watching films has a big influence on the way dreams are formed." People"s attention might be heightened during the time they are watching
TV or films.1. "this period" in  the fifth paragraph refers to________.A. the 20th century
B. the 1930s
C. the 1950s
D. the 1960s and later2 The underlined words "in the land of nod" in Paragraph 2 means________.A. in the evening
B. during travelling
C. in a dream world
D. when they are thinking3. Murzyn"s study was different from other studies because  ________.A. more people of different ages were involved
B. both diaries and questionnaires were used
C. more advanced technology was used
D. subjects were given more time to record their dreams4. From the passage, we can learn that________.A. studies on the color of dreams have been going on for many years
B. the results of the previous studies on dreams couldn"t be trusted
C. older people are more likely to be influenced by TV viewing
D. the colors of TV sets are more likely to appear in viewers"dreams5. What is the main idea of the passage?A. The color of people"s dreams changes along with their ages.
B. TV  viewing has  different  influences  on different people.
C. Childhood TV viewing may determine the color of dreams.
D. Childhood TV  viewing  may  influence  a person"s later life.

题型：同步题难度：| 查看答案

阅读理解      Britain is set to face an increase in cold winters, with up to oneinseven hitting the UK with
longer periods of time when temperatures are below freezing, a study has suggested.The
prediction was based on research that found out how low solar activity affected winter weather
patterns.
     However, the researchers were eager to stress that their findings did not suggest that the
region was about to fall suddenly into a "little ice age"．The findings appear in the journal
Environmental Research Letters."We could get to the point where oneinseven winters are very cold, as we had at the start of last winter and all through the winter before last."said coauthor
Mike Lockwood, professor of space environment physics at the University of Reading.
Using the Central England Temperature (CET) record, the world"s longest instrumental data
series that dates back to 1659,the team said that in general temperatures during recent winters
had been obviously lower than the longerterm temperatures."The mean CET for December,
January and February for the recent relatively cold winters of 2008～2009 and 2009～2010
were 3.50℃ and 2.53℃ respectively," they wrote."However, the mean value for the previous 20 winters had been 5.04℃.The series of lower winter temperatures in the UK during the last three years had raised questions about the probability of more similar, or even colder winters
occurring in the future."
     Last year Professor Lockwood and colleagues published a paper that found a link between
fewer sunspots and atmospheric conditions that "blocked" warm westerly winds reaching
Europe during winter months, opening the way for cold easterly winds from the Arctic and
Russia to sweep across the region.Professor Lockwood, while acknowledging that there were a
range of possible meteorological factors (气象因素) that could influence blocking events, said
the latest study moved things forward by showing that there was "improvement in the predictive skill" when solar activity was taken into consideration.1. We can know from the second paragraph that ________.A. research shows that Britain will soon fall into an ice age
B. Mike Lockwood"s research focuses on space environment physics
C. it was quite cold in Britain over the entire winter last year
D. so far oneinseven winters have been very cold in Britain

2. The underlined word "mean" in Paragraph 3 is closest in meaning to "________"．

A. average
B. stable
C. ungenerous
D. changeable3. What can we infer from the last paragraph?A. It was sunspots that blocked warm westerly winds reaching Europe.
B. Meteorological factors hardly have any influence on blocking events.
C. The latest study done by Professor Lockwood was of little practical value.
D. Considering solar activity or not affects the accuracy of weather forecasting.4. What"s the best title of the passage?A. Another Big Danger Approaching the UK
B. Research Finds out Solar Activity Is to Blame for the Cold
C. UK Faces More Cold Winters Due to Weaker Solar Activity
D. Changes in Weather Patterns Should Be Responsible for Low solar Activity

题型：同步题难度：| 查看答案

阅读理解

     A recent study of ancient and modern elephants 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 Universities when they were
examining the genetic relationship between the ancient woolly mammoth and mastodon to
modern elephants-the Asian elephant, African forest elephant,and African savanna elephant.
Once they obtained DNA sequences (序列) from two fossils (化石), mammoths and mastodons,
the team compared them with DNA from modern elephants.They found to their amazement that modern 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 populations 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 average shoulder height of 2.5 metres.The savanna elephant weighs between six and seven tons, roughly double the weight of the forest elephant.But the fact that they look so
different does not necessarily mean they are different species.However the proof lay in the
analysis of the DNA.
     Alfred Roca, assistant professor in the Department of Animal Sciences at the University of
Illinois, said, "We now have to treat the forest and savanna elephants as two different units for
conservation purposes.Since 1950, all African elephants have been conserved as one species.
Now that we know the forest and savanna elephants are two very distinctive animals, the forest elephant should become a bigger priority(优先) for conservation purposes."

1. One of the fossils studied by the researchers is that of________.A. the Asian elephant
B. the forest elephant
C. the savanna elephant
D. the mastodon elephant2. The underlined word"divergence" in Paragraph 4 means "________"．A. evolution
B. exhibition
C. separation
D. examination3. The researchers" conclusion was based on a study of the African elephant"s________.A. DNA
B. height
C. weight
D. population4. What are Alfred Roca"s words mainly about?

A. The conservation of African elephants.
B. The purpose of studying African elephants.
C. The way to divide African elephants into two units.
D. The reason for the distinction of African elephants.

题型：同步题难度：| 查看答案

阅读理解                                              High Speed Book Scanner
     Simply turning pages of a book quickly may not seem like the best way to scan it. A Japanese
research group at Tokyo University has created new software that allows hundreds of pages to be
scanned within minutes. Scanning text is normally a boring process with each page having to be inserted
into a scanner, but the team led by Professor Masatoshi Ishikawa uses a high speed camera that takes
500 pictures a second to scan pages as they are turned by workers.
     Normal scanners can only scan the information that is actually before them on the page. This high
speed book scanner uses a camera that captures pages at 1000fps as they are turned. A system built in
allows it to automatically correct any changes to the text due to the page bending as well as light differences due to shadows. "It takes a shot of the shape, then it calculates the shape and uses those calculations to
film the scanning," Ishikawa said, explaining the system used to reconstruct the original page.
     The current system is able to scan an average 250-page book in a little over 60 seconds using basic
computer hardware. While it now requires extra time to process the scanned images (影像), the
researchers hope to eventually make the technology both faster and much smaller. "In the more distant
future, once it becomes possible to put all of this processing on one chip (芯片) and then put that in an
iPad or iPod, one could scan just using that chip. At that point, it becomes possible to scan something
quickly to save for later reading," Ishikawa said.
     Being able to scan books with an iPhone may be further off, but Ishikawa says that a commercial
version of the large-scale computer based scanning system could be available in two or three years.
While the technology has the potential to take paper books into the digital age, it remains to be how
publishers will react to people scanning their books while just turning pages quickly.

1. According to the passage, the advantage of the new scanning software is that ______.

A. there is no need to scan every page
B. it can work much more effectively
C. no manpower is needed in operating the scanner
D. it can make the scanning process more interesting

2. According to Ishikawa, the scanner works by_____.

A. changing the shape of the images
B. reducing the size of the images
C. reconstructing the original page
D. scanning several pages at the same time

3. What is Ishikawa"s attitude towards the development of the scanning system?

A. Optimistic.
B. Uncertain.
C. Disapproving.
D. Cautious.

4. What does the underlined sentence mean?

A. People will get any book they like more easily.
B. Publishers will refuse to comment on the new software.
C. Publishers will probably not welcome the new software.
D. People won"t need to buy books any more with an iPhone.

题型：模拟题难度：| 查看答案

阅读理解     根据短文内容, 从短文后的七个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.
                                              Early Childhood Education
     Early childhood education is the formal (正规的) teaching and care of young children .It primarily
focuses on learning through playing to encourage the child"s different kinds of development.    1
     Studies with Head Start programs throughout the United States have shown some evidence that there
are quite a few advantages to early childhood education, which can produce significant gains in children"s
learning and development. Compared to a child who does not attend pre-school, children completing
their early education programs are found to be better at math and reading skills. They are excited to learn
and have the tools to do so.    2   These children are more competent in their pre-school, kindergarten
and school-age years, and they are usually reported as "friendlier" by parents and the children"s peers
(同伴).
     3 In studies with matched control groups, more students who had early schooling experiences were
employed at the age of 19, fewer were on welfare, and fewer were involved with the criminal activity.
What"s more, some studies show that children attending pre-school are more likely to graduate and have
higher education, and be well integrated (综合) as an adult.
    Early childhood education gives most children a jump-start on education for their kindergarten and
primary school years. It is clear that early childhood education can have some great benefits for children.
    4   If early childhood education is less effective, perhaps the best model is finding strategies for
allowing a parent to stay home with his or her child for at least the first two to three years. Also important
is considering a child"s own personality.    5

A. The long-term influence of early education is significant as well.
B. They can benefit greatly from encouragement in their early childhood.
C. Yet its quality must be assessed to see what kind of benefits it actually provides.
D. They are also able to relate to others in a superior way and that improves their social skills.
E. Many experts of education have concerned about what early childhood education means today.
F. Individual differences in children mean that not all children will get equal benefits from early
    childhood education.
G. It consists of activities that serve children in the pre-school years and is designed to improve
    later school performance.

题型：模拟题难度：| 查看答案