Can people change their skin color without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that determines skin color.
The gene comes in two versions, one of which is found in 99 percent of Europeans. The other is found in 93 to 100 percent of Africans, researchers at Pennsylvania State University report in the latest issue of Science.
Scientists have changed the color of a dark-striped zebra-fish（斑马鱼） to uniform gold by inserting a version of the pigment (色素) gene into a young fish. As with humans, zebra-fish skin color is determined by pigment cells, which contain melanin (黑色素). The number, size and darkness of melanin per pigment cell determine skin color.
It appears that, like the golden zebra-fish, light-skinned Europeans also have a mutation (变异) in the gene for melanin production. This results in less pigmented skin.
However, Keith Cheng, leader of the research team, points out that the mutation is different in human and zebra-fish genes.
Humans acquired dark skin in Africa about 1.5 million years ago to protect bodies from ultra-violet rays of the sun (太阳光紫外线), which can cause skin cancer.
But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vitamin D. So the related gene changes, according to Cheng.
Asians have the same version of the gene as Africans, so they probably acquired their light skin through the action of some other gene that affects skin color, said Cheng.
The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin color without damaging it like chemical treatment did on Michael Jackson.
1.The passage mainly tells us that ________.
A. people can not change their skin color without any pain
B. the new discovery could lead to research into ways to change skin color safely
C. pop king Michael Jackson often changed his skin color as he liked
D. scientists have found out that people’s skin color is determined by the gene
2.It can be inferred from the passage that _____________.
A. nowadays people who want to change their skin color have to suffer a lot from the damage caused by the chemical treatment
B. Europeans and Africans have the same gene
C. the new discovery could help to find medical treatments for skin cancer
D. there are two kinds of genes
3.Scientists have done an experiment on a dark-striped zebra-fish in order to _____________.
A. find the different genes of humans’
B. prove the humans’ skin color is determined by the pigment gene
C. find out the reason why the Africans’ skin color is dark
D. find out the ways of changing people’s skin color
4. The reason why Europeans are light-skinned is probably that _____________.
A. they are born light-skinned people
B. light-skinned Europeans have mutation in the gene for melanin production
C. they have fewer activities outside
D. they pay much attention to protecting their skin
5.The writer’s attitude towards the discovery is ______________.
A. neutral B. negative C. positive D. unconcerned
高三英语阅读理解困难题
Can people change their skin color without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that determines skin color.
The gene comes in two versions, one of which is found in 99 per cent of Europeans. The other is found in 93 to 100 per cent of Africans, researchers at Pennsylvania State University report in the latest issue of Science.
Scientists have changed the color of a dark-striped zebrafish（斑马鱼） to uniform gold by inserting a version of the pigment (色素) gene into a young fish. As with humans, zebrafish skin color is determined by pigment cells, which contain melanin (黑色素). The number, size and darkness of melanin per pigment cell determine skin color.
It appears that, like the golden zebrafish, light-skinned Europeans also have a mutation (变异) in the gene for melanin production. This results in less pigmented skin.
However, Keith Cheng, leader of the research team, points out that the mutation is different in human and zebrafish genes.
Humans acquired dark skin in Africa about 1.5 million years ago to protect bodies from ultra-violet rays of the sun (太阳光紫外线), which can cause skin cancer.
But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vitamin D. So the related gene changes, according to Cheng.
Asians have the same version of the gene as Africans, so they probably acquired their light skin through the action of some other gene that affects skin color, said Cheng.
The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin color without damaging it like chemical treatment did on Michael Jackson.
1.The passage mainly tells us that ________.
A. people can not change their skin color without any pain
B. the new discovery could lead to research into ways to change skin color safely
C. pop king Michael Jackson often changed his skin color as he liked
D. scientists have found out that people’s skin color is determined by the gene
2.It can be inferred from the passage that ________.
A. nowadays people who want to change their skin color have to suffer a lot from the damage caused by the chemical treatment
B. Europeans and Africans have the same gene
C. the new discovery could help to find medical treatments for skin cancer
D. there are two kinds of genes
3.Scientists have done an experiment on a dark-striped zebrafish in order to ________.
A. find the different genes of humans’
B. prove the humans’ skin color is determined by the pigment gene
C. find out the reason why the Africans’ skin color is dark
D. find out the ways of changing people’s skin color
4.The reason why Europeans are light-skinned is probably that _____
A. they are born light-skinned people
B. light-skinned Europeans have mutation in the gene for melanin production
C. they have fewer activities outside
D. they pay much attention to protecting their skin
5.The writer’s attitude towards the discovery is ________.
A. neutral B. negative C. positive D. unconcerned
高三英语阅读理解中等难度题查看答案及解析
Can people change their skin color without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that determines skin color.
The gene comes in two versions, one of which is found in 99 percent of Europeans. The other is found in 93 to 100 percent of Africans, researchers at Pennsylvania State University report in the latest issue of Science.
Scientists have changed the color of a dark-striped zebra-fish（斑马鱼） to uniform gold by inserting a version of the pigment (色素) gene into a young fish. As with humans, zebra-fish skin color is determined by pigment cells, which contain melanin (黑色素). The number, size and darkness of melanin per pigment cell determine skin color.
It appears that, like the golden zebra-fish, light-skinned Europeans also have a mutation (变异) in the gene for melanin production. This results in less pigmented skin.
However, Keith Cheng, leader of the research team, points out that the mutation is different in human and zebra-fish genes.
Humans acquired dark skin in Africa about 1.5 million years ago to protect bodies from ultra-violet rays of the sun (太阳光紫外线), which can cause skin cancer.
But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vitamin D. So the related gene changes, according to Cheng.
Asians have the same version of the gene as Africans, so they probably acquired their light skin through the action of some other gene that affects skin color, said Cheng.
The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin color without damaging it like chemical treatment did on Michael Jackson.
1.The passage mainly tells us that ________.
A. people can not change their skin color without any pain
B. the new discovery could lead to research into ways to change skin color safely
C. pop king Michael Jackson often changed his skin color as he liked
D. scientists have found out that people’s skin color is determined by the gene
2.It can be inferred from the passage that _____________.
A. nowadays people who want to change their skin color have to suffer a lot from the damage caused by the chemical treatment
B. Europeans and Africans have the same gene
C. the new discovery could help to find medical treatments for skin cancer
D. there are two kinds of genes
3.Scientists have done an experiment on a dark-striped zebra-fish in order to _____________.
A. find the different genes of humans’
B. prove the humans’ skin color is determined by the pigment gene
C. find out the reason why the Africans’ skin color is dark
D. find out the ways of changing people’s skin color
4. The reason why Europeans are light-skinned is probably that _____________.
A. they are born light-skinned people
B. light-skinned Europeans have mutation in the gene for melanin production
C. they have fewer activities outside
D. they pay much attention to protecting their skin
5.The writer’s attitude towards the discovery is ______________.
A. neutral B. negative C. positive D. unconcerned
高三英语阅读理解困难题查看答案及解析
Can people change their skin color without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that determines skin color.
The gene comes in two versions, one of which is found in 99 per cent of Europeans. The other is found in 93 to 100 per cent of Africans, researchers at Pennsylvania State University report in the latest issue of Science.
Scientists have changed the color of a dark-striped zebrafish（斑马鱼） to uniform gold by inserting a version of the pigment (色素) gene into a young fish. As with humans, zebrafish skin color is determined by pigment cells, which contain melanin (黑色素). The number, size and darkness of melanin per pigment cell determine skin color.
It appears that, like the golden zebrafish, light-skinned Europeans also have a mutation (变异) in the gene for melanin production. This results in less pigmented skin.
However, Keith Cheng, leader of the research team, points out that the mutation is different in human and zebrafish genes.
Humans acquired dark skin in Africa about 1.5 million years ago to protect bodies from ultra-violet rays of the sun (太阳光紫外线), which can cause skin cancer.
But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vitamin D. So the related gene changes, according to Cheng.
Asians have the same version of the gene as Africans, so they probably acquired their light skin through the action of some other gene that affects skin color, said Cheng.
The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin color without damaging it like chemical treatment did on Michael Jackson.
1. The passage mainly tells us that ________.
| A．people can not change their skin color without any pain |
| B．the new discovery could lead to research into ways to change skin color safely |
| C．pop king Michael Jackson often changed his skin color as he liked |
| D．scientists have found out that people’s skin color is determined by the gene |
2. It can be inferred from the passage that ________.
| A．nowadays people who want to change their skin color have to suffer a lot from the damage caused by the chemical treatment |
| B．Europeans and Africans have the same gene |
| C．the new discovery could help to find medical treatments for skin cancer |
| D．there are two kinds of genes |
3.Scientists have done an experiment on a dark-striped zebrafish in order to ________.
| A．find the different genes of humans’ |
| B．prove the humans’ skin color is determined by the pigment gene |
| C．find out the reason why the Africans’ skin color is dark |
| D．find out the ways of changing people’s skin color |
4.The reason why Europeans are light-skinned is probably that _____
| A．they are born light-skinned people |
| B．light-skinned Europeans have mutation in the gene for melanin production |
| C．they have fewer activities outside |
| D．they pay much attention to protecting their skin |
5.The writer’s attitude towards the discovery is ________.
| A．neutral（中立的） | B．negative | C．positive | D．indifferent（冷漠） |
高三英语阅读理解中等难度题查看答案及解析
Can people change their skin colour without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that determines skin colour. The gene comes in two versions, one of which is found in 99 per cent of Europeans. The other is found in 93 to 100 per cent of Africans, researchers at Pennsylvania State University report in the latest issue of Science.
Scientists have changed the colour of a dark-striped zebra fish to uniform gold by inserting a version of the pigment (色素) gene into a young fish. As with humans, zebra fish skin colour is determined by pigment cells, which contain melanosomes (黑色素体). The number, size and darkness of melanosomes per pigment cell determines skin colour.
It appears that, like the golden zebra fish, light-skinned Europeans also have a mutation (突变)in the gene for melanosome production. This results in less pigmented skin. However, Keith Cheng, leader of the research team, points out that the mutation is different in human and zebra fish genes.
Humans acquired dark skin in Africa about 1.5 million years ago to protect bodies from ultra-violet rays of the sun, which can cause skin cancer. But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vitamin D. So the related gene changes, according to Cheng. Asians have the same version of the gene as Africans, so they probably acquired their light skin through the action of some other gene that affects skin colours, said Cheng.
The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin colour without damaging it like chemical treatment done on Michael Jackson.
1.According to the passage, scientists have found .
A. people living in northern latitudes need more sunlight
B. the reason why people change their skin colour
C. the reason why people get skin cancer
D. the gene that determines skin colour
2.We can infer from the passage that ________.
A. people like to change their skin colour
B. a mutation in the gene for melanosome production is different in human and zebra fish gene
C. people will be able to change their skin colour without chemical treatment in the future
D. skin cancer can be cured now
3.Which of the following is NOT mentioned according to the passage?
A. The version of the pigment gene of Asians and that of Africans are the same.
B. Scientists have succeeded in turning the colour of a dark-striped zebra fish into uniform gold.
C. Dark skin can protect bodies from utral-violet rays of the sun.
D. People like pop king Michael Jackson.
4.The passage is probably taken from __________.
A. a novel B. a science report
C. a story book D. a science fiction
高三英语阅读理解中等难度题查看答案及解析
Can people change their skin colour without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that determines skin colour.
The gene comes in two versions, one of which is found in 99 per cent of Europeans. The other is found in 93 to 100 per cent of Africans, researchers at Pennsylvania State University report in the latest issue of Science.
Scientists have changed the colour of a dark-striped zebrafish to uniform gold by inserting a version of the pigment(色素) gene into a young fish. As with humans, zebrafish skin colour is determined by pigment cells, which contain melanosomes(黑色素). The number, size and darkness of melanosomes per pigment cell determines skin colour.
It appears that, like the golden zebrafish, light-skinned Europeans also have a mutation(变异) in the gene for melanosome production. This results in less pigmented skin.
However, Keith Cheng, leader of the research team, points out that the mutation is different in human and zebrafish genes.
Humans acquired dark skin in Africa about 1.5 million years ago to protect bodies from ultra-violet rays(紫外线) of the sun, which can cause skin cancer.
But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vitamin D. So the related gene changes, according to Cheng.
Asians have the same version of the gene as Africans, so they probably acquired their light skin through the action of some other gene that affects skin colour, said Cheng.
The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin colour without damaging it like chemical treatment did on Michael Jackson.
1.What is the main idea of the passage?
A. People can’t change their skin colour without any pain.
B. The new discovery helped find ways to change skin colour safely.
C. Pop king Michael Jackson often changed his skin colour as he liked.
D. Scientists have found out that people’s skin colour is determined by the gene.
2.It can be inferred from the passage that ________.
A. nowadays changing the skin colour with the chemical treatment has bad effect
B. Europeans and Africans have the same genes
C. the new discovery could help to find medical treatments for skin cancer
D. there are two kinds of skin genes
3.Scientists have done an experiment on a dark-striped zebra fish in order to ________.
A. find the different genes of humans
B. prove the humans’ skin colour is determined by the pigment gene
C. find out the reason why the Africans’ skin colour is dark
D. find out the ways of changing people’s skin colour
4.Which of the following statements is TRUE?
A. Michael Jackson died of skin damage caused by chemical treatment.
B. American blacks produce more vitamin D with their skin than others.
C. The gene determining skin colour exists widely in whites, blacks and Asians.
D. The melanosomes in the skin of blacks usually cause skin cancer more often.
高三英语阅读理解中等难度题查看答案及解析
Can people change their skin colour without suffering like pop king Michael Jackson? Perhaps yes．Scientists have found the gene that determines skin colour．
The gene comes in two versions, one of which is found in 99 per cent of Europeans．The other is found in 93 to 100 per cent of Africans, researchers at Pennsylvania State University report in the latest issue of Science．
Scientists have changed the colour of a dark-striped zebrafish to uniform gold by inserting a version of the pigment(色素) gene into a young fish．As with humans, zebrafish skin colour is determined by pigment cells, which contain melanosomes(黑色素)．The number, size and darkness of melanosomes per pigment cell determines skin colour．
It appears that, like the golden zebrafish, light-skinned Europeans also have a mutation(变异) in the gene for melanosome production．This results in less pigmented skin．
However, Keith Cheng, leader of the research team, points out that the mutation is different in human and zebrafish genes．
Humans acquired dark skin in Africa about 1．5 million years ago to protect bodies from ultra-violet rays(紫外线) of the sun, which can cause skin cancer．
But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vitamin D．So the related gene changes, according to Cheng．
Asians have the same version of the gene as Africans, so they probably acquired their light skin through the action of some other gene that affects skin colour, said Cheng．
The new discovery could lead to medical treatments for skin cancer．It also could lead to research into ways to change skin colour without damaging it like chemical treatment did on Michael Jackson．
1.What is the main idea of the passage?
A． People can’t change their skin colour without any pain．
B． The new discovery helped find ways to change skin colour safely．
C． Pop king Michael Jackson often changed his skin colour as he liked．
D． Scientists have found out that people’s skin colour is determined by the gene．
2.It can be inferred from the passage that ________．
A． nowadays changing the skin colour with the chemical treatment has bad effect
B． Europeans and Africans have the same genes
C． the new discovery could help to find medical treatments for skin cancer
D． there are two kinds of skin genes
3.Scientists have done an experiment on a dark-striped zebra fish in order to ________．
A． find the different genes of humans
B． prove the humans’ skin colour is determined by the pigment gene
C． find out the reason why the Africans’ skin colour is dark
D． find out the ways of changing people’s skin colour
4.Which of the following statements is TRUE?
A． Michael Jackson died of skin damage caused by chemical treatment．
B． American blacks produce more vitamin D with their skin than others．
C． The gene determining skin colour exists widely in whites, blacks and Asians．
D． The melanosomes in the skin of blacks usually cause skin cancer more often．
高三英语阅读理解中等难度题查看答案及解析
Millions of people around the world suffer from a painful addiction to biting their nails， which can be harder than smoking cigarettes．
A．to be quitted B．to quit
C．to have quitted D．to quitting
高三英语单项填空中等难度题查看答案及解析
Millions of people around the world suffer from a painful addiction to biting their nails，which can be harder________than smoking cigarettes．
A．to be quitted B．to quit
C．to have quitted D．to quitting
高三英语单项填空中等难度题查看答案及解析
--- Andrew won’t like it, you know. Can you change its color?
--- ________! I don’t care what Andrew thinks.
| A．No way | B．No problem | C．It’s out of question | D．It’s no wonder |
高三英语单项填空简单题查看答案及解析
This unjust _______ of people on the basis of skin color was challenged.
A.determination B.adaptation C.separation D.submission
高三英语单项填空中等难度题查看答案及解析