Some people are right-handed£¨¹ßÓÃÓÒÊֵģ©and some are left-handed£® 1 knows the reason why a person becomes right-handed or left-handed£® It is not true that it is caused by the 2 in which his parents educate him£® In other words, a person is 3 to be right-handed or left-hand-ed£® Moreover, the left-handed and the right-handed "think" differently£® 4 use the hand you're not 5 can be very upsetting£®
One day I tried an experiment: 6 hands while eating rice with chopsticks£¨¿ê×Ó£©£®Being a right-hander, I hoped it would not be too 7 for me to take the food with my left hand£® Soon after I started, I realized I didn't know what I was 8 £®So I moved in front of a big mirror in order that I could observe my 9 clearly£® Looking at myself in the mirror, I found I looked 10 a man who had 11 used chopsticks£® I grew more and more nervous and finally I had to 12 £®
My experience shows, being 13 to use the hand one is not used to affects£¨Ó°Ï죩a person's mind£® So we should not try to change a left-hander to a right-hander£® Some people still think 14 is bad, but luckily this idea is 15 £®
| ¡¡¡¡ 1£®A£®one ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ B£®Somebody ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ C£®The scientist ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ D£®One's parent ¡¡¡¡ ¡¡¡¡ | |
| ¡¡¡¡ 2£®A£®plan ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ B£®way ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ C£®skill ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ D£®rule ¡¡¡¡ ¡¡¡¡ | |
| ¡¡¡¡ 3£®A£®taught ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ B£®born ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ C£®asked ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ D£®made ¡¡¡¡ ¡¡¡¡ | |
| ¡¡¡¡ 4£®A£®Need to ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ B£®Forced to ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ C£®Having to ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ D£®In order to ¡¡¡¡ ¡¡¡¡ | |
| ¡¡¡¡ 5£®A£®fond of ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ B£®interested in ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ C£®eager to ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ D£®used to ¡¡¡¡ ¡¡¡¡ | |
| ¡¡¡¡ 6£®A£®changing ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ B£®using ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ C£®holding ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ D£®watching ¡¡¡¡ ¡¡¡¡ | |
| ¡¡¡¡ 7£®A£®harmful ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ B£®hard ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ C£®tired ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ D£®disappointing ¡¡¡¡ ¡¡¡¡ | |
| ¡¡¡¡ 8£®A£®eating ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ B£®watching ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ C£®doing ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ D£®holding ¡¡¡¡ ¡¡¡¡ | |
| ¡¡¡¡ 9£®A£®face ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ B£®chopsticks ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ C£®right hand ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ D£®actions ¡¡¡¡ ¡¡¡¡ | |
| ¡¡¡¡ 10£®A£®for ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ B£®like ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ C£®through ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ D£®after ¡¡¡¡ ¡¡¡¡ | |
| ¡¡¡¡ 11£®A£®always ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ B£®often ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ C£®usually ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ D£®never ¡¡¡¡ ¡¡¡¡ | |
| ¡¡¡¡ 12£®A£®give it up ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ B£®give it in ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ C£®give it out ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ D£®give it off ¡¡¡¡ ¡¡¡¡ | |
| ¡¡¡¡ 13£®A£®able ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ B£®unable ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ C£®forced ¡¡¡¡ ¡¡¡¡ | ¡¡¡¡¡¡¡¡ D£®willing ¡¡¡¡ ¡¡¡¡ | |
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¡¡¡¡ 14£®A£®being left-handed ¡¡¡¡ ¡¡¡¡C£®using one hand ¡¡¡¡ ¡¡¡¡ |
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¡¡¡¡ B£®being right-handed ¡¡¡¡ D£®using either hand ¡¡¡¡ ¡¡¡¡ |
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¿ÆÄ¿£º¸ßÖÐÓ¢Óï À´Ô´£º ÌâÐÍ£ºÔĶÁÀí½â
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(É«ËØ) gene into a young fish. As with humans, zebrafish skin colour is determined by pigment cells, which contain melanosomes(ºÚÉ«ËØ). 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(±äÒì) 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 of the sun(Ì«Ñô¹â×ÏÍâÏß), 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.
The passage mainly tells us that ________.
A. people can not change their skin colour without any pain
B. the new discovery could lead to search into 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
It can be inferred from the passage that ________.
A. nowadays people who want to change their skin colour 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
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 peopl¡¯s skin colour
The writer¡¯s attitude towards the discovery is ________.
A. neutral B. negative C. positive D. indifferent
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÓ¢Óï À´Ô´£º ÌâÐÍ£ºÔĶÁÀí½â
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(É«ËØ) gene into a young fish. As with humans, zebrafish skin colour is determined by pigment cells, which contain melanosomes(ºÚÉ«ËØ). 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(±äÒì) 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 of the sun(Ì«Ñô¹â×ÏÍâÏß), 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.
The passage mainly tells us that ________.
A. people can not change their skin colour without any pain
B. the new discovery could lead to search into 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
It can be inferred from the passage that ________.
A. nowadays people who want to change their skin colour 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
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 peopl¡¯s skin colour
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 gen for melanosome production
C. they have fewer activities outside D. they pay much attention to protecting their skin
The writer¡¯s attitude towards the discovery is ________.
A. neutral B. negative C. positive D. indifferent
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÓ¢Óï À´Ô´£º ÌâÐÍ£ºÔĶÁÀí½â
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(É«ËØ) gene into a young fish. As with humans, zebrafish skin colour is determined by pigment cells, which contain melanosomes(ºÚÉ«ËØ). 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(±äÒì) 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 of the sun(Ì«Ñô¹â×ÏÍâÏß), 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.
51. The passage mainly tells us that ________.
A. people can not change their skin colour without any pain
B. the new discovery could lead to search into 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
52. It can be inferred from the passage that ________.
A. nowadays people who want to change their skin colour 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
53. 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 peopl¡¯s skin colour
54. 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 gen for melanosome production
C. they have fewer activities outside
D. they pay much attention to protecting their skin
55. The writer¡¯s attitude towards the discovery is ________.
A. neutral B. negative C. positive D. indifferent
²é¿´´ð°¸ºÍ½âÎö>>
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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(É«ËØ) gene into a young fish. As with humans, zebrafish skin colour is determined by pigment cells, which contain melanosomes(ºÚÉ«ËØ). 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(±äÒì) 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 dif ferent 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(Ì«Ñô¹â×ÏÍâÏß), 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 vit amin D. So the related gene changes, according to Cheng.
Asians have the same version of the gene as Africans, so they pr obably 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.. The passage mainly tells us that ________.
A. people can not change their skin colour without any pain
B. the new discovery could lead to search into 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.. 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 peopl¡¯s skin colour
3.. 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 melanosome production
C. they have fewer activities outside
D. they pay much attention to protecting their skin
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÓ¢Óï À´Ô´£º°²»ÕÊ¡ÆÚÄ©Ìâ ÌâÐÍ£ºÔĶÁÀí½â
That cold January night, I was growing sick of my life in San Francisco. There I was walking home ²é¿´´ð°¸ºÍ½âÎö>>
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