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    Ants have a reputation for strength,organization and teamwork.But researchers have now discovered that a key secret to the success of ants is their ability to identify the importance of age in the work place.
    A study of Gentral American leaf-cutter ants has shown that the younger and stronger members are give the toughest job of cutting therough the leaves they harvest.Their sharp youn teeth do this job effectively,but as they get older their teeth become relatively worn and blunt.
    But rather than being retired or abandoned by the group,the ageing ants are given a new role more suyted to their physical abilities.They become carriers and teansport the leaves back to the kingdom where they are harvested for food.
    The findings by researchers from the University of Oregon and the Oregong State University support previous research showin the survival of a leaf-cutter kingdom depends on the efficiency(效率）of is workers.
    “Cuting leaves is hard work,”said Dr.Robert Schofield,who led the research team.“Much of the cutting is done with a V-shaped blade(刀片）between teeth on their jaws.This blade starts out as sharp as the sharpest razor blade that humans have developed.”But over rime the teeth become blunter and the cutting job slows down.The team estimated that,because of this age-related wear,a colony(蚁群)spent twice the energy cutting leaves than it would if all the ants had sharp blades.Its findings support the idea that wear and break can be significant problems for insects as well as largre animals.
    Like humans,leaf-cuttre ant recognize that older members of the group can still make a worhwhile contribution to society.“This study shows an advantage of social living that we are familiar with,”said Dr.Schofield.
    【小题1】The younger and stronger ants do the toughest job because      .

    A．they can teansport the leaves effectively
    B．they have a sharp blade to cut leaves
    C．other members are busy with other work
    D．they can finish the job in a better organized way
    【小题2】The undrelined word“blunt”in the second paragraph can be replaced by      .
    A．quite looseB．less sharp
    C．quite fragileD．more dirty
    【小题3】What happens to the ants when they become old?
    A．They no longer hve work to do.
    B．They keep doing the same work.
    C．They have to leave and live on themselves.
    D．They are given a new worthwhile job.
    【小题4】It can be learned from the passage that       .
    A．Dr.Schofield is the first to research leaf-cuttre ants
    B．older ants are more powerful in carrying leaves
    C．large animals can also suffer from some kind of wear
    D．leaf-cutter ants are the most lever ants in the world
    【小题5】What can be the best title for the passage?
    A．The key secret to the success of ants
    B．The developed structure of ant colony
    C．The most challenging job for leaf-cutter ants
    D．No V-shaped blade,no success of ants

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    Ants have a reputation for strength,organization and teamwork.But researchers have now discovered that a key secret to the success of ants is their ability to identify the importance of age in the work place.

    A study of Gentral American leaf-cutter ants has shown that the younger and stronger members are give the toughest job of cutting therough the leaves they harvest.Their sharp youn teeth do this job effectively,but as they get older their teeth become relatively worn and blunt.

    But rather than being retired or abandoned by the group,the ageing ants are given a new role more suyted to their physical abilities.They become carriers and teansport the leaves back to the kingdom where they are harvested for food.

    The findings by researchers from the University of Oregon and the Oregong State University support previous research showin the survival of a leaf-cutter kingdom depends on the efficiency(效率）of is workers.

    “Cuting leaves is hard work,”said Dr.Robert Schofield,who led the research team.“Much of the cutting is done with a V-shaped blade(刀片）between teeth on their jaws.This blade starts out as sharp as the sharpest razor blade that humans have developed.”But over rime the teeth become blunter and the cutting job slows down.The team estimated that,because of this age-related wear,a colony(蚁群)spent twice the energy cutting leaves than it would if all the ants had sharp blades.Its findings support the idea that wear and break can be significant problems for insects as well as largre animals.

    Like humans,leaf-cuttre ant recognize that older members of the group can still make a worhwhile contribution to society.“This study shows an advantage of social living that we are familiar with,”said Dr.Schofield.

    1.The younger and stronger ants do the toughest job because      .

    A．they can teansport the leaves effectively

    B．they have a sharp blade to cut leaves

    C．other members are busy with other work

    D．they can finish the job in a better organized way

    2.The undrelined word“blunt”in the second paragraph can be replaced by      .

    A．quite loose

    B．less sharp

    C．quite fragile

    D．more dirty

    3.What happens to the ants when they become old?

    A．They no longer hve work to do.

    B．They keep doing the same work.

    C．They have to leave and live on themselves.

    D．They are given a new worthwhile job.

    4.It can be learned from the passage that       .

    A．Dr.Schofield is the first to research leaf-cuttre ants

    B．older ants are more powerful in carrying leaves

    C．large animals can also suffer from some kind of wear

    D．leaf-cutter ants are the most lever ants in the world

    5.What can be the best title for the passage?

    A．The key secret to the success of ants

    B．The developed structure of ant colony

    C．The most challenging job for leaf-cutter ants

    D．No V-shaped blade,no success of ants

     

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    阅读理解

    　　Ants have a reputation for strength, organization and teamwork．But researchers have now discovered that a key secret to the success of ants is their ability to identify the importance of age in the work place．

    　　A study of Gentral American leaf-cutter ants has shown that the younger and stronger members are give the toughest job of cutting the rough the leaves they harvest．Their sharp young teeth do this job effectively, but as they get older their teeth become relatively worn and blunt．

    　　But rather than being retired or abandoned by the group, the ageing ants are given a new role more suited to their physical abilities．They become carriers and transport the leaves back to the kingdom where they are harvested for food．

    　　The findings by researchers from the University of Oregon and the Oregong State University support previous research show in the survival of a leaf-cutter kingdom depends on the efficiency(效率)of is workers．

    　　“Cutting leaves is hard work, ”said Dr．Robert Schofield, who led the research team．“Much of the cutting is done with a V-shaped blade(刀片)between teeth on their jaws．This blade starts out as sharp as the sharpest razor blade that humans have developed．”But over rime the teeth become blunter and the cutting job slows down．The team estimated that, because of this age-related wear, a colony(蚁群)spent twice the energy cutting leaves than it would if all the ants had sharp blades．Its findings support the idea that wear and break can be significant problems for insects as well as larger animals．

    　　Like humans, leaf-cutter ant recognize that older members of the group can still make a worthwhile contribution to society．“This stud shows an advantage of social living that we are familiar with, ”said Dr．Schofield．

    (1)

    The younger and stronger ants do the toughest job because _________．

    [　　]

    A．

    they can transport the leaves effectively

    B．

    they have a sharp blade to cut leaves

    C．

    other members are busy with other work

    D．

    they can finish the job in a better organized way

    (2)

    The underlined word “blunt” in the second paragraph can be replaced by _________．

    [　　]

    A．

    quite loose

    B．

    less sharp

    C．

    quite fragile

    D．

    more dirty

    (3)

    What happens to the ants when they become old?

    [　　]

    A．

    They no longer have work to do．

    B．

    They keep doing the same work．

    C．

    They have to leave and live on themselves．

    D．

    They are given a new worthwhile job．

    (4)

    It can be learned from the passage that _________．

    [　　]

    A．

    Dr．Schofield is the first to research leaf-cuttre ants

    B．

    older ants are more powerful in carrying leaves

    C．

    large animals can also suffer from some kind of wear

    D．

    leaf-cutter ants are the most lever ants in the world

    (5)

    What can be the best title for the passage?

    [　　]

    A．

    The key secret to the success of ants

    B．

    The developed structure of ant colony

    C．

    The most challenging job for leaf-cutter ants

    D．

    No V-shaped blade, no success of ants

    查看答案和解析>>

    阅读理解

    　　Ants have a reputation for strength, organization and teamwork．But researchers have now discovered that a key secret to the success of ants is their ability to identify the importance of age in the work place．

    　　A study of Central American leaf-cutter ants has shown that the younger and stronger members are given the toughest job of cutting through the; leaves they harvest．Their sharp young teeth do this job effectively, but as they get older their teeth become relatively worn and blunt．

    　　But rather than being retired or abandoned by the group, the ageing ants are given a new role more suited to their physical abilities．They become carriers and transport the leaves back to the kingdom where they are harvested for food．

    　　The findings by researchers from the University of Oregon and the Oregon State University support previous research showing the survival of a leaf-cutter kingdom depends on the efficiency(效率)of its workers．

    　　"Cutting leaves is hard work," said Dr．Robert Schofield, who led the research team．"Much of the cutting is done with a V-shaped blade(刀片)between teeth on their jaws．This blade starts out as sharp as the sharpest razor blade that humans have developed．" But over time the teeth become blunter and the cutting job slows down．The team estimated that, because of this age-related wear, a colony(蚁群)spent twice the energy cutting leaves than it would if all the ants had sharp blades．Its findings support the idea that wear and break can be significant problems for insects as well as larger animals．

    　　Like humans, leaf-cutter ants recognize that older members of the group can still make a worthwhile contribution to society．"This study shows an advantage of social living that we are familiar with," said Dr．Schofield．

    (1)

    The younger and stronger ants do the toughest job because _________．

    [　　]

    A．

    they can transport the leaves effectively

    B．

    they have a sharp blade to cut leaves

    C．

    other members are busy with other work

    D．

    they can finish the job in a better organized way

    (2)

    The underlined word "blunt" in the second paragraph can be replaced by _________．

    [　　]

    A．

    quite loose

    B．

    less sharp

    C．

    quite fragile

    D．

    more dirty

    (3)

    What happens to the ants when they become old?

    [　　]

    A．

    They no longer have work to do．

    B．

    They keep doing the same work．

    C．

    They have to leave and live on themselves．

    D．

    They are given a new worthwhile job．

    (4)

    It can be learned from the passage that _________．

    [　　]

    A．

    Dr．Schofield is the first to research leaf-cutter ants

    B．

    older ants are more powerful in carrying leaves

    C．

    large animals can also suffer from some kind of wear

    D．

    leaf-cutter ants are the most -lever ants in the world

    (5)

    What can be the best title for the passage?

    [　　]

    A．

    The key secret to the success of Ants

    B．

    The developed structure of ant colony

    C．

    The most challenging job for leaf-cutter ants

    D．

    No V-shaped blade, no success of ants

    查看答案和解析>>

    Sam、David、Elisa、Ezra和Terry想通过选修某一门课程解决各自的问题。阅读下面六门选修课程的介绍（A、B、C、D、E和F），选出可以解答各自疑问的最佳选项。选项中有一项是多余选项。

    1．Sam: How can I develop the characters so as to make my story interesting?

    2．David: When writing an essay, how can I make my points in a more organized manner?

    3．Elisa: When I deliver a speech, how can I attract and hold the attention of the audience?

    4．Ezra: How is our knowledge of the world formed in early childhood?

    5．Terry: My English vocabulary is limited．How can I enlarge it more effectively?

    A

    B

    I. Putting Ideas into Words （EL991-1A ）

    Here’s a challenge: what if writing could be more than just throwing words on a page?

    In this course, you’ll learn not only about different writing styles, but also about writing as a means of figuring out a problem and communicating your thought process to the world．

    This week-long workshop will explore the balance between self-expression and effective communication, offering a unique view into the world of academia （学术界）．Comments will be given to students and you’ll make great progress in your writing if you take this course!

    High School as a Social Laboratory:

    An Introduction to Sociology （SO902-3B）

    In this class, we’ll learn about broad sociological theories, but we’ll discuss those theories in relation to what sociologists have done before studying American high schools and youngsters．We’ll explore the issues such as gender, race, class, and violence in society at large, and the ways in which American high schools reflect those social issues．We’ll watch films and documentaries, such as “Mean Girls” and “Bowling for Columbine”, that make these connections, and you’ll write papers making these connections for yourself based on your own experiences．

    C

    D

    II. Children’s Thinking （BI911-1B）

    This course will introduce students to children’s thinking．It will explore the ever-changing views on cognitive （认知的）, social and language development from newborns to middle childhood．Specific topics include: What do babies know about objects, numbers, categories and people? Why is language learning easier for children? What can we learn from children with developmental disorders?

    Through lectures, discussions, projects and in-class activities, students will gain an understanding of how scientists study children’s thinking．

    III.  Creative Writing Workshop （EL905-4A ）

    This course will excite young writers with many tools and approaches to the writing process in either fiction or poetry．It will inspire you to experiment with new writing techniques, such as how to describe a person, a scene, or a situation, etc．It is just for students who have a serious interest in creative writing, who are not afraid to experiment with structure, and who want to develop a daily writing practice．In the group writing classes, students will have the opportunity to explore both genres （体裁） whether enrolled in the poetry or fiction workshop．

    E

    F

    IV.   The Secrets of Learning and Memory （BN901-3A）

    Individual memory abilities vary greatly．There are famous people with strong memories who can remember 5,000 playing cards in exact sequence, and others who cannot store any long-term memories, where each morning is a strange new world．And you may wonder how the brain manages to identify and sort memories into different types, then keep them from 5 seconds to a lifetime, waiting for a signal to recall them in great detail．

    Students completing this exciting course will gain useful knowledge of how the brain learns, remembers and forgets．

    V.    Persuasive Communication （TA905-1A）

    This course will introduce you to the arts of organization, style, and delivery to help make you a more confident and persuasive public speaker．You will deliver speeches to your classmates and receive detailed comments from both the teacher and one another．Lectures on developing outlines, coping with speaker anxiety, and making effective use of visual aids will help you improve your skills in public speaking．Building on these skills, the later part of the course will teach you how to prepare a persuasive message based on your individual interests and goals．

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