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单选题
Paleontologists hypothesize that modern birds evolved from the family of dinosaurs that included Tyrannosaurus rex. This hypothesis would be strongly supported if evidence that dinosaurs from this family had a body covering resembling feathers could be found, but so far no such evidence has been found. Which of the following, if true, would most help the paleontologists explain why no evidence of feathered dinosaurs has yet been found?
A
Fossilized dinosaurs have shown many birdlike characteristics, such as bone structure and winglike arms.
B
If birds are in fact the descendants of dinosaurs, then it can be argued that the dinosaurs never really died out.
C
Flying dinosaurs such as the Pteranodon, which is not thought to have been related to modern birds, do not appear to have had feathers.
D
Soft tissues such as skin and feathers do not fossilize like bones, and therefore are far less likely to have left permanent evidence in the fossil record.
E
The thousands of dinosaur fossils excavated by paleontologists represent only a tiny fraction of the billions of dinosaurs that once lived.
参考答案
参考解析
解析：
D项为未发掘到恐龙皮肤的原因提供了一个可能的答案，故D项是正确的。E项与问题的关联度不如D项，所以不选E项。
D项为未发掘到恐龙皮肤的原因提供了一个可能的答案，故D项是正确的。E项与问题的关联度不如D项，所以不选E项。
更多 “单选题Paleontologists hypothesize that modern birds evolved from the family of dinosaurs that included Tyrannosaurus rex. This hypothesis would be strongly supported if evidence that dinosaurs from this family had a body covering resembling feathers could be found, but so far no such evidence has been found. Which of the following, if true, would most help the paleontologists explain why no evidence of feathered dinosaurs has yet been found?A Fossilized dinosaurs have shown many birdlike characteristics, such as bone structure and winglike arms.B If birds are in fact the descendants of dinosaurs, then it can be argued that the dinosaurs never really died out.C Flying dinosaurs such as the Pteranodon, which is not thought to have been related to modern birds, do not appear to have had feathers.D Soft tissues such as skin and feathers do not fossilize like bones, and therefore are far less likely to have left permanent evidence in the fossil record.E The thousands of dinosaur fossils excavated by paleontologists represent only a tiny fraction of the billions of dinosaurs that once lived.” 相关考题
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A．deduce
B．decide
C．declare
D．deceive
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B. How to write a book about business.
C. What the book is about.
D. What the writer's family is like.
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共用题干
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共用题干
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共用题干
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共用题干
The FamilyThe structure of a family takes different forms around the world and even in the same society.The family's form changes as it adapts to changing social and economic influences.Until recently, the most common form in North America was the nuclear family,consisting of a married couple with their minor children.The nuclear family is an independent unit.It must be prepared to fend for itself. Individual family members strongly depend on one another. There is little help from outside the family in emergencies.Elderly relatives of a nuclear family are cared for only if it is possible for the family to do so.In North America,the elderly often do not live with the family;they live in retirement communities and nursing homes.There are many parallels between the nuclear family in industrial societies,such as NorthAmerica,and of families in societies such as that of the Inuits,who live in harsh environments.The nuclear family structure is well adapted to a life of mobility. In harsh conditions,mobility allows the family to hunt for food.For North Americans,the hunt for jobs and improved social status also requires mobility.The nuclear family was not always the North American standard.In a more agrarian time,the small nuclear family was usually part of a larger extended family.This might have included grandparents,mother and father,brothers and sisters,uncles,aunts,and cousins.In North America today,there is a dramatic rise in the number of single-parent households.Twice as many households in the United States are headed by divorced, separated,or never-married individuals as are comprised of nuclear families. The structure of the family,not just in North America,but throughout the world,continues to change as it adapts to changing conditions.According to the passage,which is the definition of a nuclear family?A:.A nuclear family is a married couple with their minor children.B: A nuclear family is a single father with minor children.C: A nuclear family concludes parents,grandparents,and children.D: A nuclear family concludes parents,children,and aunts and uncles.
考题
共用题干
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考题
使用font-family设置字体时，以下书写正确的是（）A、body{font-family：Arial，"微软雅黑"，"宋体"，"黑体"；}B、body{font-family："微软雅黑"，"宋体"，"黑体"，Arial；}C、body{font-family："TimesNewRoman"；}D、body{font-family：TimesNewRoman；}
考题
If an enterprise customer required a switch for their branch office access layer, which family of switches would the customer likely choose from?（）A、Cisco Catalyst 2000 and 3000B、Cisco NexusC、Cisco Catalyst 4000 and 6000D、Cisco SFS 3000/7000
考题
单选题The skulls and pelvic bones of some species of dinosaur share characteristics with the skulls and pelvic bones of all modern birds. Even though not all dinosaurs have these characteristics, there are scientists who claim that all animals that do have these characteristics are dinosaurs. If the statements above and the claim of the scientists are true, which of the following must also be true?A
Birds share more characteristics with dinosaurs than they do with other animals.B
Some ancient dinosaurs were indistinguishable from modern birds.C
All animals whose skulls share the characteristics of those of modern birds also have pelvic bones that are similar to those of modern birds.D
Modern birds are dinosaurs.E
All dinosaurs are birds.
考题
单选题Some paleontologists claim that the discovery of what appear to be feathers in the fossil of an Archosaur could force a revision of current theories on the phylogeny of Archosaurs, alter conceptions of dinosaur skin surfaces, and require scholars to credit birds with a far earlier orion than previously thought.A
require scholars to credit birds with a far earlier origin than previously thoughtB
scholars may be required to credit birds with a far earlier origin than previously thoughtC
require a crediting by scholars of birds with a far earlier origin than previously thoughtD
compared to what was previously thought, require scholars to credit birds with a far earlier originE
crediting birds with a far earlier origin than scholars had previously though
考题
单选题They achieved more than they had ever dreamed, lending a magic to their family story that no tale or ordinary life could possibly rival.A
confirmB
achieveC
matchD
exaggerate
考题
单选题Through receiving financial support from family, community or the government is allowed, it is never admired.A
AsB
OnceC
AlthoughD
Lest
考题
单选题If an enterprise customer required A switch for their branch office access layer, which family of switches would the customer likely choose from?（）A
Cisco SFS 3000/7000B
Cisco Catalyst 2000 and 3000C
Cisco Catalyst 4000 and 6000D
Cisco Nexus
考题
单选题If an enterprise customer required a switch for their branch office access layer, which family of switches would the customer likely choose from?（）A
Cisco Catalyst 2000 and 3000B
Cisco NexusC
Cisco Catalyst 4000 and 6000D
Cisco SFS 3000/7000
考题
单选题What changes did the emergence of factories have on the family?A
It separated men from women in the family.B
Women had to work alongside their husbands in factories.C
Women had to leave home to work in factories.D
Men had lost their dominating role in the family.
考题
单选题When Lawrence was young, ______.A
his mother was a teacherB
his father had no workC
his family was not richD
his family was not poor
考题
单选题According to the passage, the caste system would affect all except which of the following scenarios in a caste-observant Indian person’s life?A
A Brahman is having dinner with foreign visitors and is offered either a hamburger or a bowl of rice.B
A Vaishya mother is considering which of the young women in the local town would make suitable marriage prospects for her son.C
Two Sudra teenagers engage in a foot race, and the younger of the two wins the race.D
A 40-year-old man from the Untouchable caste has moved from the countryside to a large city and must look for work in order to support his family.E
The home of a Kshatriya family is located near a city sewer line, which bursts one day and floods the family’s garage.
考题
单选题He was a man of noble _____. He came from an old and prominent family in Virginia.A
sourceB
rootC
resourceD
origin
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