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    The author presents this passage by . A. telling an interesting story B. describing an activity in a lively way C. testing an idea by reasoning D. introducing a practical method 答案 68.C 69.B 70.A 71.D Passage 12 People diet to look more attractive. Fish diet to avoid being beaten up, thrown out of their social group, and getting eaten as a result. That is the fascinating conclusion of the latest research into fish behavior by a team of Australian scientists. The research team have discovered that subordinate fish voluntarily diet to avoid challenging their larger competitors. “In studying gobies we noticed that only the largest two individuals, a male and female, had breeding rights within the group, explains Marian Wong. “All other group members are nonbreeding females, each being 5-10% smaller than its next largest competitor. We wanted to find out how they maintain this precise size separation. The reason for the size difference was easy to see. Once a subordinate fish grows to within 5-10% of the size of its larger competitor, it causes a fight which usually ends in the smaller goby being driven away from the group. More often than not, the evicted fish is then eaten up. It appeared that the smaller fish were keeping themselves small in order to avoid challenging the boss fish. Whether they did so voluntarily, by restraining how much they ate, was not clear. The research team decided to do an experiment. They tried to fatten up some of the subordinate gobies to see what happened. To their surprise, the gobies simply refused the extra food they were offered, clearly preferring to remain small and avoid fights, over having a feast. The discovery challenges the traditional scientific view of how boss individuals keep their position in a group. Previously it was thought that large individuals simply used their weight and size to threaten their subordinates and take more of the food for themselves, so keeping their competitors small. While the habits of gobies may seem a little mysterious, Dr. Wong explains that understanding the relationships between boss and subordinate animals is important to understanding how hierarchical societies remain stable. The research has proved the fact that voluntary dieting is a habit far from exclusive to humans. “As yet, we lack a complete understanding of how widespread the voluntary reduction of food intake is in nature, the researchers comment. “Data on human dieting suggests that, while humans generally diet to improve health or increase attractiveness, rarely does it improve long-term health and males regularly prefer females that are fatter than the females’ own ideal. 【查看更多】

     

    题目列表(包括答案和解析)

    Find Which Direction Is South

    Do you have a good sense of direction? If not, please take with you a compass. But if you forget to take a compass, you can still find your way. 

    It’s never a good idea to imagine that the family member who was entrusted（委托）with the job of map-reading actually knows where the family is. You can tell by the slightly confused load on their faces that nothing on the ground seems to match the map. Never mind. The shu is shining and it’s still morning. If you don’t know the exact time, you can still find out where south is, but you’ll need to be patient. 

    ①Find a straight sick and put it in the ground in a place where you can mark its shadow. 

    ②Try to position the stick as vertically（垂直）as you can. You can check this by making a simple plumb line （铅锤线）with a piece of string and weight. You haven’t got any string? OK, use a thread from your clothes with a button tied at the end to act as a weight. 

    ③Mark the end of the shadow cast by the stick. 

    ④Wait approximately half an hour and mark the end of the shadow again. 

    ⑤Keep doing this until you have made several marks. 

    ⑥The mark nearest the stick will represent the shortest shadow, which is cast at midday, when the sun is highest in the sky and pointing to the exact south. 

    ⑦Pick a point in the distance along the line between the shortest shadow and the stick. 

    ⑧That point is south of where you are. 

    ⑨Now you can turn the map, like you did before, and find which way you should be travelling.

    6To find the direction, we ought to be patient probably because

    A. it is not easy to find a proper stick     

    B. it is not easy to position the stick

    C. it takes hours to make the marks       

    D. it takes about half an hour to make the marks

    The passage would probably be most helpful to      . 

    A. those who draw maps            B. those who get lost

    C. those who make compasses       D. those who do experiments

    Which of the following pictures best shows the way of finding the direction of south?

    The author presents this passage by      . 

    A. telling an interesting story         B. describing an activity in a lively way

    C. testing an idea by reasoning        D. introducing a practical method

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    阅读理解

    　　Find Which Direction Is South

    　　Do you have a good sense of direction?If not, please take with you a compass．But if you forget to take a compass, you can still find your way．

    　　It’s never a good idea to imagine that the family member who was entrusted(委托)with the job of map-reading actually knows where the family is．You can tell by the slightly confused load on their faces that nothing on the ground seems to match the map．Never mind．The shu is shining and it’s still morning．If you don’t know the exact time, you can still find out where south is, but you’ll need to be patient．

    　　①Find a straight sick and put it in the ground in a place where you can mark its shadow．

    　　②Try to position the stick as vertically(垂直)as you can．You can check this by making a simple plumb line(铅锤线)with a piece of string and weight．You haven’t got any string?OK, use a thread from your clothes with a button tied at the end to act as a weight．

    　　③Mark the end of the shadow cast by the stick．

    　　④Wait approximately half an hour and mark the end of the shadow again．

    　　⑤Keep doing this until you have made several marks．

    　　⑥The mark nearest the stick will represent the shortest shadow, which is cast at midday, when the sun is highest in the sky and pointing to the exact south．

    　　⑦Pick a point in the distance along the line between the shortest shadow and the stick．

    　　⑧That point is south of where you are．

    　　⑨Now you can turn the map, like you did before, and find which way you should be travelling．

    (1)

    To find the direction, we ought to be patient probably because

    [　　]

    A．

    it is not easy to find a proper stick

    B．

    it is not easy to position the stick

    C．

    it takes hours to make the marks

    D．

    it takes about half an hour to make the marks

    (2)

    The passage would probably be most helpful to ________．

    [　　]

    A．

    those who draw maps

    B．

    those who get lost

    C．

    those who make compasses

    D．

    those who do experiments

    (3)

    Which of the following pictures best shows the way of finding the direction of south?

    [　　]

    A．

    B．

    C．

    D．

    (4)

    The author presents this passage by ________．

    [　　]

    A．

    telling an interesting story

    B．

    describing an activity in a lively way

    C．

    testing an idea by reasoning

    D．

    introducing a practical method

    查看答案和解析>>

    Find Which Direction Is South  

    Do you have a good sense of direction? If not, please take with you a compass. But if you forget to take a compass, you can still find your way.   

    It’s never a good idea to imagine that the family member who was entrusted（委托）with the job of map-reading actually knows where the family is. You can tell by the slightly confused load on their faces that nothing on the ground seems to match the map. Never mind. The shu is shining and it’s still morning. If you don’t know the exact time, you can still find out where south is, but you’ll need to be patient.   

    ①Find a straight sick and put it in the ground in a place where you can mark its shadow.  

    ②Try to position the stick as vertically（垂直）as you can. You can check this by making a simple plumb line （铅锤线）with a piece of string and weight. You haven’t got any string? OK, use a thread from your clothes with a button tied at the end to act as a weight.   

    ③Mark the end of the shadow cast by the stick.   

    ④Wait approximately half an hour and mark the end of the shadow again.   

    ⑤Keep doing this until you have made several marks.   

    ⑥The mark nearest the stick will represent the shortest shadow, which is cast at midday, when the sun is highest in the sky and pointing to the exact south.   

    ⑦Pick a point in the distance along the line between the shortest shadow and the stick.   

    ⑧That point is south of where you are.   

    ⑨Now you can turn the map, like you did before, and find which way you should be travelling.  

    68. To find the direction, we ought to be patient probably because  

    A. it is not easy to find a proper stick      B. it is not easy to position the stick  

    C. it takes hours to make the marks        D. it takes about half an hour to make the marks

    69. The passage would probably be most helpful to       .   

    A. those who draw maps           B. those who get lost  

    C. those who make compasses       D. those who do experiments  

    70. Which of the following pictures best shows the way of finding the direction of south?  

     
     

      

    71. The author presents this passage by       .   

    A. telling an interesting story        B. describing an activity in a lively way  

    C. testing an idea by reasoning       D. introducing a practical method  

    查看答案和解析>>

     

    Find Which Direction Is South

    Do you have a good sense of direction? If not, please take with you a compass. But if you forget to take a compass, you can still find your way.  

    It’s never a good idea to imagine that the family member who was entrusted（委托）with the job of map-reading actually knows where the family is. You can tell by the slightly confused load on their faces that nothing on the ground seems to match the map. Never mind. The shu is shining and it’s still morning. If you don’t know the exact time, you can still find out where south is, but you’ll need to be patient.  

    ①Find a straight sick and put it in the ground in a place where you can mark its shadow.  

    ②Try to position the stick as vertically（垂直）as you can. You can check this by making a simple plumb line （铅锤线）with a piece of string and weight. You haven’t got any string? OK, use a thread from your clothes with a button tied at the end to act as a weight.  

    ③Mark the end of the shadow cast by the stick.  

    ④Wait approximately half an hour and mark the end of the shadow again.  

    ⑤Keep doing this until you have made several marks.  

    ⑥The mark nearest the stick will represent the shortest shadow, which is cast at midday, when the sun is highest in the sky and pointing to the exact south.  

    ⑦Pick a point in the distance along the line between the shortest shadow and the stick.  

    ⑧That point is south of where you are.  

    ⑨Now you can turn the map, like you did before, and find which way you should be travelling.  

    1.To find the direction, we ought to be patient probably because

    A. it is not easy to find a proper stick      B. it is not easy to position the stick

    C. it takes hours to make the marks        D. it takes about half an hour to make the marks

    2.The passage would probably be most helpful to       .  

    A. those who draw maps           B. those who get lost

    C. those who make compasses       D. those who do experiments

    3.Which of the following pictures best shows the way of finding the direction of south?

     

    4.The author presents this passage by       .  

    A. telling an interesting story        B. describing an activity in a lively way

    C. testing an idea by reasoning       D. introducing a practical method

     

    查看答案和解析>>

    Find Which Direction Is South

    Do you have a good sense of direction? If not, please take with you a compass. But if you forget to take a compass, you can still find your way.

    It’s never a good idea to imagine that the family member who was entrusted（委

    托）with the job of map-reading actually knows where the family is.

    You can tell by the slightly confused load on their faces that nothing on the

    ground seems to match the map. Never mind. The hun is shining and it’s still morning. If you don’t know the exact time, you can still find out where south is, but you’ll need to be patient.  

    Find a straight stick and put it in the ground in a place where you can mark its

    shadow.

    Try to position the stick as vertically（垂直）as you can. You can check this by

    making a simple plumb line （铅锤线）with a piece of string and weight. You haven’t got any string? OK, use a thread from your clothes with a button tied at the end to act as a weight.   

    Mark the end of the shadow cast by the stick. 

    Wait about half an hour and mark the end of the shadow again. 

    Keep doing this until you have made several marks. 

    The mark nearest the stick will represent the shortest shadow, which is cast at midday, when the sun is highest in the sky and pointing to the exact south. 

    Pick a point in the distance along the line between the shortest shadow and the stick. That point is south of where you are.  

    Now you can turn the map, like you did before, and find which way you should be travelling.  

    68. To find the direction, we ought to be patient probably because

        A. it is not easy to find a proper stick   B. it is not easy to position the stick

    C. it takes hours to make the marks    D. it takes about half an hour to make the marks

    69.The passage would probably be most helpful to       .   

    A. those who draw maps           B. those who get lost

    C. those who make compasses       D. those who do experiments  

    70. The author presents this passage by       .   

    A. telling an interesting story       

    B. describing an activity in a lively way

    C. testing an idea by reasoning      

    D. introducing a practical method

    71. Which of the following pictures best shows the way of finding the direction of south?

    查看答案和解析>>


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