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 .
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A．they can teansport the leaves effectively |
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B．they have a sharp blade to cut leaves |
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C．other members are busy with other work |
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D．they can finish the job in a better organized way |
2.The undrelined word“blunt”in the second paragraph can be replaced by .
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A．quite loose |
B．less sharp |
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C．quite fragile |
D．more dirty |
3.What happens to the ants when they become old?
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A．They no longer hve work to do. |
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B．They keep doing the same work. |
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C．They have to leave and live on themselves. |
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D．They are given a new worthwhile job. |
4.It can be learned from the passage that .
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A．Dr.Schofield is the first to research leaf-cuttre ants |
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B．older ants are more powerful in carrying leaves |
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C．large animals can also suffer from some kind of wear |
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D．leaf-cutter ants are the most lever ants in the world |
5.What can be the best title for the passage?
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A．The key secret to the success of ants |
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B．The developed structure of ant colony |
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C．The most challenging job for leaf-cutter ants |
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D．No V-shaped blade,no success of ants |
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We will teach you how to properly care for cats and birds.
1.Top Dog Trainer School aims to .
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A．help people to be excellent experienced walkers |
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B．teach people how to do business successfully |
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C．help people to start a career related with animals |
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D．eam some money by giving diplomas to its leamers |
2.We can infer from the passage that the Anatolian Shepherd,compared with a toy poodbl,is .
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A．much more expensive to buy |
B．much smaller in size |
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C．more difficult to care for |
D．more troblesome in training |
3.Which of the following is not a peomise made by the dog trainer school?
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A．To start your ownbusiness with affordable money. |
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B．To make a fortune after the training in the school. |
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C．To have wide experience in animal care. |
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D．To find a satisfactory job in this school. |
4.Through the courses you will learn .
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A．the secrets of how to train the horses |
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B．how to take care of some pets and birds |
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C．how to search for business chanses on the internet |
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D．how to keep your customers'houses clean and healthy |
5.We can resd the passage in the part of a newspaper.
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A．entertainment |
B．advertisement |
C．science |
D．business |
May was born with a cleft palate(腭裂). When she was a little girl, she had to 36 the jikes from naughty chidren who teased her about her misshaped lip. With all the teasing, Mary grew up 37 the fact that she was“diffrernt”. She was 38 that no one, outside her family,could ever love her until she 39 Mrs. Leonard's class.
In Mrs. Leonards' school at that time, it was 40 for teachers to give their children an annual 41 test. However, in Mary's case, 42 her cleft palate, she was hardly able to hear out of one ear. 43 not to let the other children have another“ 44 "to point out, she would 45 when her bad ear was tested each year. The “hearing test”was 46 by having a child walk to the classroom door,turn sideways, 47 one ear with a fingre, and then 48 what the teacher whispered. When Mary had to turn her bad ear towards her teacher she would 49 to cover her good ear. She knew that teachers 50 often say things like,“The sky is blue,”or“What color are your shoes?”But not on that day. Surely, God 51 seven words in
Mrs. Leonard's mouth that 52 Mary's life forever. When the test came, Mary heard:“ I wish you were my little girl.”You can imagine how deeply these words 53 Mary.
Yes, affirming (肯定）words are 54 to say to the people around you. While words from
a godly teacher can soften a heart, words form you can powerfully set the 55 of another
One's life.
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18..
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A．hurt |
B．moved |
C．upset |
D．scared |
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－Could you possilby take to the railway station tomorrow?
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A．No way |
B．Never mind |
C．Not at all |
D．No problem |
The paty last month really gave me a lot of fun. So can we have this month,Mr.
James?
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A．any |
B．one |
C．another |
D．the other |
Many young people just can't live without the Intemet, they depend on for whatever information they need.
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A．which |
B．when |
C．where |
D．what |
