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    What is the result of Justin Halberda's tests? A. Students who did well in the tests also did well in math exams.B. One cannot be successful in math if he has a well number sense.C. One who has a strong number sense can not do math well.D. One should do a lot of math homework if he wants to have a number sense. BDID you get a flu shot this year? For the first time, the Centers for Disease Control and Prevention in the US is recommending that all children aged from 6 months to 18 years receive the flu vaccine.Vaccines battle diseases caused by bacteria and viruses. A weakened form of the germ is introduced into the body. The body makes special substances called antibodies to fight the germs. If the actual germs were to attack, the antibodies would fight it. Because there are many kinds of flu viruses, scientists must create a new vaccine formula each year. Researchers must make a prediction.It is like forecasting the weather. Sometimes they are right on, and sometimes they are off. But even when the vaccine does not closely match circulating flu types, it can make the illness less serious. "The flu vaccine is not as effective as the polio vaccine or the measles vaccine," says Dr William Schaffner of Vanderbilt University School of Medicine. "It's not a great vaccine, but it is quite a good vaccine."But a flu vaccine doesn't work for everyone. There are certain people who should be careful about taking it.Because the vaccine is produced in eggs, those who are allergic to eggs should not take it. If you have a fever, you should wait until you recover.Some people are afraid that they might get the flu from the flu shot. Scientists say that it is not possible, because the viruses in the flu shot are inactivated. But some minor side effects such as low-grade fever and body ache could occur. If they do, they begin soon after the shot and usually last only one to two days.Did you know?Smallpox was the first disease people tried to prevent by putting a virus into a healthy person. In 1796, English scientist Edward Jenner placed some infected material under a boy's skin. 【查看更多】

     

    题目列表(包括答案和解析)

    NOT all math skills are learned in the classroom. Some of them come naturally. Consider the split-second calculations  you make when you estimate (估计) the number of empty seats on the school bus or the number of cookies in a cookie jar.

    These estimates can often be done without counting. That's because humans are born with the ability to closely guess the number of items in a group. Researchers call this ability a person's "number sense".

    To see how a person's inborn number sense might be linked to mathematical performance in the classroom, psychologist Justin Halberda and his colleagues from Johns Hopkins University in Baltimore, US ran some tests.

    The scientists asked 64 14-year-olds to look at images (影像) of yellow and blue dots that flashed on a computer screen for a fraction (一小部分) of a second. Each image contained between 10 and 32 dots that varied in size.

    Some images contained twice as many blue dots  as yellow dots. In other images, however, the number of blue and yellow dots was nearly equal. For each image, the students were asked to estimate which color had more dots.

    The scientists found a wide variation in how well students could pick the color with the most dots.

    The scientists then looked at the students' math scores dating back to kindergarten. Children that performed best in the image test also scored the highest in standard math tests.

    The same finding held true at the other end of the spectrum (范围). Students who didn't score well on the image test received lower math scores.

    The study was the first to show a link between a person's inborn number sense and his or her achievement in formal math training.

    Does this connection mean that one cannot be good in math if they have a weak number sense? Or that having a strong number sense is a guarantee for good grades in math? The answers are not clear.

    While scientists continue looking at the possible links between a person's number sense and math achievement, one thing is certain: Doing lots of math homework will  boost your chances of success.

     

    56. Which of the following is not true according to the passage?    

    A. Everyone has an inborn number sense.

    B. Those who have a strong number sense are sure to do well in math.

    C. Some of the math skills are inborn.

    D. Doing a lot of math exercises may help to learn math well.

    57. Justin Halberda and his colleagues ran some tests to               .    

    A. look at the students' math scores dating back to kindergarten.

    B. ask the students to estimate the dots

    C. see if a person's inborn number sense has something to do with math learning

    D. decide how to learn math well

    58. What is the proper meaning of the underlined word "boost"?   

    A. increase                                                                      B. grasp         

    C. miss                                                                           D. possess

    59. According to the passage, the most important thing to learn math well is that               .  

    A. one should have an inborn number sense

    B. one should practice a lot

    C. one should do a lot of tests

    D. one should do a lot of counting

    60. What is the result of Justin Halberda's tests?    

    A. Students who did well in the tests also did well in math exams.

    B. One cannot be successful in math if he has a well number sense.

    C. One who has a strong number sense can not do math well.

    D. One should do a lot of math homework if he wants to have a number sense.                 

     

     

     

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    Not all math skills are learned in the classroom．Some of them come naturally．Consider the split-second calculations  you make when you estimate（估计）the number of empty seats on the school bus or the number of cookies in a cookie jar．

    These estimates can often be done without counting．That's because humans are born with the ability to closely guess the number of items in a group．Researchers call this ability a person's "number sense"．

    To see how a person's inborn number sense might be linked to mathematical performance in the classroom, psychologist Justin Halberda and his colleagues from Johns Hopkins University in Baltimore, US ran some tests．

    The scientists asked 64 14-year-olds to look at images of yellow and blue dots that flashed on a computer screen for a fraction （一小部分） of a second．Each image contained between 10 and 32 dots that varied in size．

    Some images contained twice as many blue dots  as yellow dots．In other images, however, the number of blue and yellow dots was nearly equal．For each image, the students were asked to estimate which color had more dots．

    The scientists found a wide variation in how well students could pick the color with the most dots．

    The scientists then looked at the students' math scores dating back to kindergarten．Children that performed best in the image test also scored the highest in standard math tests．The same finding held true at the other end of the spectrum （范围）．Students who didn't score well on the image test received lower math scores．

    The study was the first to show a link between a person's inborn number sense and his or her achievement in formal math training．

    Does this connection mean that one cannot be good in math if they have a weak number sense? Or that having a strong number sense is a guarantee for good grades in math? The answers are not clear．

    While scientists continue looking at the possible links between a person's number sense and math achievement, one thing is certain: Doing lots of math homework will  boost your chances of success．

    1．Justin Halberda and his colleagues ran some tests to               ．   

           A．look at the students' math scores dating back to kindergarten．

           B．ask the students to estimate the dots

           C．see if a person's inborn number sense has something to do with math learning

           D．decide how to learn math well

    2．What is the proper meaning of the underlined word "boost"?   

           A．increase              B．grasp         C．miss                      D．possess

    3．According to the passage, the most important thing to learn math well is that             ． 

           A．one should have an inborn number sense

           B．one should practice a lot

           C．one should do a lot of tests

           D．one should do a lot of counting

    4．What is the result of Justin Halberda's tests?

           A．Students who did well in the tests also did well in math exams．

           B．One cannot be successful in math if he has a well number sense．

           C．One who has a strong number sense can not do math well．

           D．One should do a lot of math homework if he wants to have a number sense．

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