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题型:阅读理解 题类:常考题 难易度:普通

阅读理解

    Mosquitoes have an extraordinary ability to find humans far away and fly straight to their skin. Mosquitoes can do more than cause an itchy (发痒的)wound. Some mosquitoes spread several serious diseases, including Dengue, yellow fever and malaria.

    Over one million people worldwide die from these diseases each year. New research now shows how mosquitoes choose who to bite.

    Mosquitoes need blood to survive. They are attracted to human skin and breath. They smell the carbon dioxide gas, which all mammals breathe out. This gas is the main way for mosquitoes to know that a warm-blooded creature is nearby.

    But mosquitoes also use their eyes and sense of touch. Michael Dickinson is a professor at the California Institute of Technology. His research shows how these small insects, with even smaller brains, use three senses to find a blood meal.

    Michael Dickinson's team used plumes—a material that rises into the air of carbon dioxide gas into a wind tunnel (隧道). They then used cameras to record the mosquitoes. The insects followed the plume.

    Then, the scientists placed dark objects on the lighter colored floor and walls of the tunnel. Mr. Dickinson said, at first, the mosquitoes showed no interest in the objects at all. “What was quite surprising is that the mosquitoes fly back and forth for hours. These are hungry females and they completely ignore the objects on the floor and wall of the tunnel. But the moment they get a hit of CO₂, they change their behavior quite obviously and now would become attracted to these little visual blobs (斑点).”

    This suggested to the researchers that a mosquito's sense of smell is more important in the search for food. Once mosquitoes catch a smell of a human or animal, they also follow visual signals.

(1)、What do mosquitoes mainly use to find their food?

A、Sense of smell.  B、Sense of touch. C、Sense of sight. D、Smart brains.
(2)、The first response of the mosquitoes to the objects in the experiment is ________.

A、to fly to the dark ones B、to catch and stick to them C、to take no notice of them D、to attach themselves to them
(3)、How can we avoid being attacked by mosquitoes according to the text?

A、Don't let them see us. B、Use dark objects to stop them. C、Make them fly back and forth for hours. D、Attract them to objects full of carbon dioxide gas.
(4)、What can be the best title for the text?

A、How Do Mosquitoes Survive? B、Why Do Mosquitoes Need Blood? C、How Do Mosquitoes Choose to Bite You? D、Why Do Mosquitoes Attack the Human Being?
举一反三
阅读理解

    In order to help customers find what they want quickly, it's important to keep the thousands of titles in the Main Street Movies store organized properly. This section of the Employee Handbook will tell you how to organize videos.

    Each Main street Movies store has three main sections:

1). New Releases Wall.

2). Film library.

3). Video Games.

    New Releases Wall. Almost 70 percent of movie rentals are new releases, and that is the first place where most customers go when they enter the store. The center section of shelves on this wall holds Hottest Hits. When new titles come into the store, place them on this wall in alphabetical order. The shelves beside Hottest Hits are called Recent Releases. The New Releases Wall, including the Hottest Hits and Recent Releases shelves, holds about 350 titles.

    Film Library. The thousands of titles in the Film Library are organized into categories. The films within each category are displayed alphabetically. Here are the categories and their two-letter computer codes:

AC

Action

DR

Drama

HO

Horror

CH

Children

FA

Family

MU

Music

CO

Comedy

FL

Foreign Language

SC

SCIENCE Fiction

    Foreign Language titles include films that were originally made in a foreign language and films with foreign language subtitles. A sticker on the back of each box tells which type of film it is.

    Video Game. All the video games in Main street Movies are arranged in alphabetical order. Although video games represent only a small percentage of our inventory(库存), they are stolen more often than any other type of goods in our store. Therefore, video games are never displayed on the shelves. Shelves in the Video Game section hold cardboard with pictures and information about each game. When a customer wants to rent a particular game, you then find the game from the locked case behind the counter.

阅读理解

    Whether in the home or the workplace, social robots are going to become a lot more common in the next few years. Social robots are about to bring technology to the everyday world in a more humanized way, said Cynthia Breazeal, chief scientist at the robot company Jibo.

    While household robots today do the normal housework, social robots will be much more like companions than mere tools. For example, these robots will be able to distinguish when someone is happy or sad. This allows them to respond more appropriately to the user.

    The Jibo robot, arranged to ship later this year, is designed to be a personalized assistant. You can talk to the robot, ask it questions, and make requests for it to perform different tasks. The robot doesn't just deliver general answers to questions; it responds based on what it learns about each individual in the household. It can do things such as reminding an elderly family member to take medicine or taking family photos.

    Social robots are not just finding their way into the home. They have potential applications in everything from education to health care and are already finding their way into some of these spaces.

    Fellow Robots is one company bringing social robots to the market. The company's "Oshbot" robot is built to assist customers in a store, which can help the customers find items and help guide them to the product's location in the store. It can also speak different languages and make recommendations for different items based on what the customer is shopping for.

    The more interaction the robot has with humans, the more it learns. But Oshbot, like other social robots, is not intended to replace workers, but to work alongside other employees. "We have technologies to train social robots to do things not for us, but with us," said Breazeal.

阅读理解

    Getting less sleep has become a bad habit for most American kids. According to a new survey by the National Sleep Foundation, 51% of kids aged 10 to 18 go to bed at 10 pm or later on school nights, even though they have to get up early. Last year the Foundation reported that nearly 60% of 7- to 12-year-olds said they felt tired during the day, and 15% said they had fallen asleep at school.

    How much sleep you need depends a lot on your age. Babies need a lot of rest: most of them sleep about 18 hours a day! Adults need about eight hours. For most school-age children, ten hours is ideal. But the new National Sleep Foundation survey found that 35% of 10- to 12-year-olds get only seven or eight hours. And guess what almost half of the surveyed kids said they do before bedtime? Watch TV.

    “More children are going to bed with TVs on, and there are more opportunities(机会) to stay awake, with more homework, the Internet and the phone,” says Dr. Mary Carskadon, a sleep researcher at Brown University Medical School. She says these activities at bedtime can get kids all excited and make it hard for them to calm down and sleep. Other experts say part of the problem is chemical. Changing levels of body chemicals called hormones not only make teenagers' bodies develop adult characteristics, but also make it hard for teenagers to fall asleep before 11 pm.

    Because sleepiness is such a problem for teenagers, some school districts have decided to start high school classes later than they used to. Three years ago, schools in Edina, Minnesota, changed the start time from 7:25 am to 8:30 am. Students, parents and teachers are pleased with the results.

阅读理解

    When I got home after dropping out of college in my junior year because of depression, I didn't want to get out of bed. But my parents wanted me to, so I just transferred myself to the couch in the living room. Sometimes I would turn on the TV and watch marathons of Chopped, but mostly I just sat there, lost in thought.

    One day when I was lying on the couch, not knowing what to do, I wondered since I had been out of school for a long time, I might as well do something productive with my life. I looked at my options. I could attend some kind of online college class, go to in-person events just to get out of the house, or take up a hobby. But none of these things made me happy, and my depression seemed to keep me drowning under the waves.

    There was something that was my thing—entrepreneurship. No matter what kind of day I'm having now, the mere mention of start-ups still perks me up. I have been starting business in some kinds of forms ever since I was a kid, and despite everything, this passion has never changed.

    So I started thinking of ideas, seeing which one could become practical business. I spent my days glued to a wide purple notebook, a pen in hand, sometimes moving from the couch to the table on our back porch in the mornings. If I got up early enough, I'd watch the sun come up. It was there, in the still mornings, that I learned about life and started to look back on mine.

    With time going on, the depression started to lift. I was making more progress in my recovery, and the good days were more frequent than the bad. I started a couple of different businesses, eventually settling on a web design business, and did a lot of experiments and changed my ideas, and after a while, things started to work.

阅读理解

    We can achieve knowledge either actively or passively. We achieve it actively by direct experience, by testing and proving an idea, or by reasoning.

    We achieve knowledge passively by being told by someone else. Most of the learning that takes place in the classroom and the kind that happens when we watch TV or read newspapers or magazines is passive. We are used to passive learning, and it's not surprising that we depend on it in our everyday communication with friends and co-workers. Unfortunately, passive learning has a serious problem. It makes us tend to accept what we are told even when it is little more than hearsay and rumor.

    Did you ever play the game Rumor? It begins when one person writes down a message but doesn't show it to anyone. Then the person whispers it, word for word, to another person. That person, in turn, whispers it to still another, and so on, through all the people playing the game. The last person writes down the message word for word as he or she hears it. Then the two written statements are compared. Typically, the original message has changed.

    That's what happens in daily life. The simple fact that people repeat a story in their own words changes the story. Then, too, most people listen to improve on it, stamping(打上标记) it with their own personal style. Yet those who hear it think they know.

    This process is also found among scholars and authors: A statement of opinion by one writer may be re-stated as fact by another, who may in turn be quoted by yet another; and this process may continue, unless it occurs to someone to question the facts on which the original writer based his opinion or to challenge the interpretation he placed upon those facts.

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