Two brightly colored butterflies have just flown by. They seems to be exactly alike, but actually one is a little larger than the other. The larger insect has a wingspread (翼长) of up to four inches. The smaller one has a wingspread of less than three inches and also a black line on its back wings.
At first sight, it is hard to tell them apart. Would you guess from this that they are different-sized butterflies of the same species? Or that they are different species of butterflies but close relatives belonging to the same family? If you said yes to either question, you would be wrong, for these look-alikes belong to quite different families.
The larger insect is the monarch butterfly (黑脉金斑蝶). As a baby insect, the monarch feeds on milkweed, which seems to give the monarch a disagreeable taste and smell. The bright coloring of the monarch acts as a warning sign to its enemy. Birds that eat butterflies soon recognize the monarch and quickly learn to leave it alone.
The smaller insect is the viceroy (副王峡蝶), which feeds on the leaves of trees. Birds would find this insect tasty, but because it looks like the monarch, birds keep away from it. The viceroy’s similarity to the monarch gives it some protection from its enemies and helps it survive.
There are other pairs of look-alike butterflies, bees and moths. In each case, one either has a disagreeable taste or smell, or can give a painful sting (叮咬). The larger is called the model. The insect that imitates (模仿) this model for protection is called the mimic.The best title for the passage is ______.
| A．The taste and the smell |
| B．The model and the mimic |
| C．Look-alikes learn from each other |
| D．The similarities and the differences |
The bright coloring of the monarch butterflies is used to ______.
| A．catch other butterflies | B．warn small insects |
| C．express their ideas | D．scare away the enemy |
Which of the following statements is TRUE?
| A．There are few look-alikes among insects. |
| B．The monarch butterfly and the viceroy are not close relatives. |
| C．There are only a few species of butterflies in the wild. |
| D．A monarch butterfly rules the world of butterflies. |
BEIJING, Jan. 11(Xinhuanet)-- Sleeping a little bit longer a day might help fight against obesity（肥胖）, a recent study shows. The research-- published in the Archives of Internal Medicine along with an editorial by Turek and Northwestern colleague Joseph Bass commenting on it and related research-- after comparing people of normal weight- a body mass index of less than 25- with those who were overweight or obese , found that sleeping for an extra 20 minutes each night could offer a pain-free way to lose weight.
Insufficient sleep is linked with changes in hormone levels that may stimulate（刺激）appetite. A series of studies in recent months have shown that the less people sleep, the heavier they tend to be.
American researcher Robert Vorona from Eastern Virginia Medical School in Norfolk and colleagues have now examined the relationship between people's self-reported sleep time per 24 hours and their body mass index(BMI). They found that total sleep time and BMI were inversely correlated was total sleep time decreased, BMI increased, except in the severely obese group." Americans experience insufficient sleep and corpulent bodies. Clinicians are aware of the burden of obesity on patients," the study said. "Our findings suggest that major extensions of sleep time may not be necessary, as an extra 20 minutes of sleep per night seems to be associated with a lower body mass index," it added. "We warn that this study does not establish a cause-and-effect relationship between restricted sleep and obesity (but) investigations demonstrating success in weight loss via extensions of sleep would help greatly to establish such a relationship."
In November 2004, researchers from Columbia University in New York City, New York demonstrated a clear link between the risk of being obese and hours of nightly sleep, finding that people aged 32 to 59 who slept four hours or less per night were 73% more likely to be obese than people who slept between seven and nine hours per night.The research, which was published in the Archives of Internal Medicine, found that____________.
sleeping for a shorter time a day might help fight agianst obesity
an extra 20 minutes’ sleep each night could offer a way to lose weight wothout pain
total sleep time and body mass index were inversely related
people aged 32 to 59 who slept four hours or less per night were 73% more likely to be obese than people who slept between seven and nine hours per nightHow many research results are presented in the text?
| A．Two | B．Three | C．Four | D．Five |
What does the underlined word “obses” probably mean?
| A．thin | B．fat | C．energetic | D．painful |
According to the text , the author intends to tell us that _____________________.
| A．Sleeping a little bit longer a day might help fight against obesity |
| B．insufficient sleep is linked with changes in hormone lives |
| C．there exists a clear link between the risk of being obeses and hours of nightly sleep |
| D．the less people sleep , the heavier they tend to be |
A recent study, published in last week’s Journal of the American Medical Association, offers a picture of how risky it is to get a lift from a teenage driver. Indeed, a 16-year-old driver with three or more passengers is three times as likely to have a fatal accident as a teenager driving alone. By contrast, the risk of death for drivers between 30 and 59 decreases with each additional passenger.
The author also found that the death rates for teenage drivers increased dramatically after 10 p.m., and especially after midnight, with passengers in the car, the driver was even more likely to die in a late-night accident.
Robert Foss, a scientist at the University of North Carolina Highway Safety Research Center, says the higher death rates for teenage drivers have less to do with “really stupid behavior” than with just a lack of driving experience. “The basic issue.” he says, “is that adults who are responsible for issuing licenses fail to recognize how complex and skilled a task driving is.”
Both he and the author of the study believe that the way to mitigate (使……缓解)the problem is to have states institute so-called graduated licensing systems, in which getting a license is a multistage process. A graduated license requires that a teenager first prove himself capable of driving in the presence of an adult, followed by a period of driving with night of passenger restrictions, before graduating to full driving privileges.
Graduated licensing systems have reduced teenage driver crashes, according to recent studies, About half of the states now have some sort of graduated licensing system in place, but only 10 of those states have restrictions on passengers, California is the strictest, with a novice(新手)driver prohibited from carrying any passenger under 20(without the presence of an adult over 25)for the first six months. Which of the following situations is most dangerous according to the passage?
| A．Adults giving a lift to teenagers on the highway after 10 p.m. |
| B．A teenager driving after midnight with passengers in the car. |
| C．Adults driving with three or more teenage passengers late at night. |
| D．A teenager getting a lift from a stranger on the highway at midnight. |
According to Robert Foss, the high death rate of teenage drivers is mainly due to ________
| A．their frequent driving at night |
| B．their improper way of driving |
| C．their lack of driving experience |
| D．their driving with passengers |
According to Paragraph 3. which of the following statements is TRUE?
| A．Teenagers should spend more time learning to drive. |
| B．Driving is a skill too complicated for teenagers to learn. |
| C．Restrictions should be imposed on teenagers applying to take driving lessons. |
| D．The licensing authorities are partly responsible for teenagers' driving accidents. |
A suggested measure to be taken to reduce teenagers' driving accidents is that ________ .
| A．driving in the presence of an adult should be made a rule |
| B．they should be prohibited from taking on passengers |
| C．they should not be allowed to drive after 10 p.m. |
| D．the licensing system should be improved |
Dear Editor,
Brockingham is run by people who are more interested in tourists than its residents. The problem is that the people running the government refuse to accept new ideas. By banning(禁止) all fast-food restaurants and discount stores, they take away all the places kids can afford to shop.
These people forget that when they were young, they could go to the South Street Soda Fountain and get an ice-cream soda for 25 cents. Today you can’t find an ice-cream soda anywhere in Brockingham for less than $2! Where can kids go for a snack?
There is not a single restaurant in Brockingham where a family of four can eat dinner for less than $100. Add a 15% tip and sales tax and you have spent nearly $125 to eat a meal you could prepare at home for about $12. Have you noticed that Brockingham families never dine in Brockingham?
Fast-food restaurants are also a good place for school kids to get an after-school job. Fast-food restaurants are busiest during the early supper hours when students are able to work, whereas the fancy food restaurants cater to late-night diners. Working in one of these establishments requires working shifts that are too late for most students.
The City Council claims that local merchants, rather than national chains, should benefit from the tourist business. I agree that it is important to support local businesses, but I think the fast-food restaurants would encourage more people to shop in Brockingham.
Another thing that disturbs me is that we must travel 25 miles to the nearest discount store. If I need a tire for my bike, I have a choice of buying one at Surf and Peddle Sport Shop for $15 or driving to Parkersburg Discount Center where I can buy the same kind of tire for $9. Again, I think the ban on all food chains and discount houses is counterproductive for our city.
Wes Woodrow
9th-Grade Student at Brockingham High SchoolWhy does Wes Woodrow write this letter to the editor?
Because the government bans all fast-food restaurants and discount stores in Brockingham.
Because the writer can’t find an ice-cream soda anywhere in Brockingham for less than $2.
Because a family of four can’t find a restaurant in Brockingham to eat dinner for less than $100.
Because the writer has to travel 25 miles to the nearest discount store. From the letter we can infer that _____.
the writer used to buy a lot of ice-cream soda
the students refuse to work in fancy food restaurants
the government’s ban benefits local merchants much
discount stores usually offer a discount of 40% The underlined word “counterproductive” in paragraph 6 of the letter probably means _____.
| A．cheap, not expensive | B．surprising, not expected |
| C．harmful, not helpful | D．doubtful, not sure |
One way the writer of this letter tries to convince the reader is by _____.
complaining that someone has to drive him to Parkersburg
getting an after-school job in fast-food restaurant himself
suggesting that many businessmen have the same opinion
giving specific examples of the high costs in Brockingham
Amazed zoo visitors watch as an orangutan(猩猩) named Bonnie swings along cables way above their heads. She’s not making a great ape escape; she’s taking a “highway” to higher learning.
Bonnie is traveling on the Orangutan Transit System, called the O-Line, at the National Zoo in Washington, D.C. The O-Line stretches from the Great Ape House, where Bonnie lives, to an exhibit called Think Tank. There she and other orangutans participate in a study trying to answer the questions: Do animals think? If so, how?
Think Tank scientists look for clues that an animal is thinking. A baby orangutan following its mother is probably not thinking. But an orangutan using a stick to reach honey in a beehive probably is thinking. It’s figuring out how to obtain a sweet treat.
To learn more about what the orangutans are thinking, Think Tank scientists are teaching orangutans a language of symbols. The apes don’t actually speak. They point to the symbols to show their thoughts.
Each symbol stands for a word. Different categories of the symbols have their own shapes. Food symbols, for example, are rectangles(矩形); object symbols are circles; and verbs are diamonds.
Computers help the orangutans learn the symbolic language. After the apes are shown an apple, for example, their task is to touch the apple symbol on a computer screen. They can do so. All six orangutans have learned a few symbols, but only Azy and Indah have learned eight symbols and can use the computer.
Azy and Indah choose to live at Think Tank. The others commute(往返) from the Great Ape House on the O-Line. All attend Think Tank sessions, though none are made to do so. “They’re eager to learn”, one of the scientists says. “They never turn me down!”What is the main idea of the passage?
Scientists are doing research on whether animals can think and how they think.
Biologists have found that orangutans are more intelligent than other animals.
Orangutans at the National Zoo can be taught to communicate with humans easily.
Animals are being taught by scientists to speak to one another at the National Zoo. The Orangutan Transit System refers to _____.
a way that can teach animals to learn things and communicate quickly
a place for various animals in the National Zoo to participate in the study
a walkway for the orangutans to travel to different sections of the zoo
a line for the orangutans to travel between the Great Ape House and the Think Tank According to the passage, scientists use a system of symbols to help _____.
find out which orangutan can learn the symbolic language fast
attract all the orangutans to live together at Think Tank
communicate with the orangutans and understand them better
understand whether animals can learn a language and express themselves by using it It can be inferred from the passage that _____.
a baby orangutan has his own intention though following his mother
many animals in the wild can learn symbolic languages to express their thoughts
the cleverer the animals are, the more knowledge they would like to learn
orangutans can form mental images in their minds when they see objects
M When Paul was a boy growing up in Utah, he happened to live near a copper smelter(炼铜厂), and the chemicals that poured out had made a wasteland out of what used to be a beautiful forest. One day a young visitor looked at this wasteland and called it an awful area. Paul knocked him down. From then on, something happened inside him.
Years later Paul was back in the area, and he went to the smelter office. He asked if they had any plans or if they would let him try to bring the trees back.. The answer from that big industry was “No.”
Paul then went to college to study the science of plants. Unfortunately, his teachers said there weren't any birds or squirrels to spread the seeds. It would be a waste of his life to try to do it. Everyone knew that, he was told. Even if he was knowledgeable as he had expected, he wouldn’t get his idea accepted.
Paul later got married and had some kids. But his dream would not die. And then one night he did what he could with what he had. As Samuel Johnson wrote, “It is common to overlook what is near by keeping the eye fixed on something remote. Attainable good is often ignored by minds busied in wide ranges.” Under the cover of darkness, he went secretly into the wasteland and started planting.
And every week, he made his secret journey into the wasteland and planted trees and grass. For fifteen years he did this against the plain common sense. Slowly rabbits appeared. Later, as there was legal pressure to clean up the environment, the company actually hired Paul to do what he was already doing.
Now the place is fourteen thousand acres of trees and grass and bushes, and Paul has received almost every environmental award Utah has. It took him until his hair turned white, but he managed to keep that impossible vow he made to himself as a child.When Paul was a boy, _____.
he had decided never to leave his hometown
the economy of Utah depended wholly on the copper smelter
no laws were made to protect the environment against pollution
he had determined to stop the copper smelter polluting the areaWhy did Paul go to college to study the science of plants?
He wanted to find out the best way to save the area himself.
He was interested in planting trees since he was young.
He wanted to get more knowledgeable people to help him.
He thought his knowledge would make his advice more persuasive.What does the underlined phrase “the plain common sense” probably refer to?
That it was impossible for trees to grow on the wasteland.
That his normal work and life would be greatly affected.
That no one would like to join him in the efforts.
That he had to keep everything he did secret.The message of the passage is that _____.
action speaks louder than words
perseverance(持之以恒) will work wonders
God helps those who help themselves
many hands make light work
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