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 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 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

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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(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 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(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 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

In ancient China tea was probably used as a relish(开胃小菜) and as a medicine. Tea was first brewed(煮泡) as a medicine around 2,700 BC in the western mountains of China. Tea was likely seen as healthy in part because it was made with boiled water, which is safer to drink in an area of polluted water.
Tea drinking, and commercial cultivation(种植)，spread during the Tang Dynasty, 618-907, especially after a Buddhist monk(佛教僧侣), wrote a book on the virtues of tea, Cha Ching. Tea gradually became one of the seven basic necessities of Chinese life (The others are fuel, rice, oil, salt, soy sauce, and vinegar.)
A Japanese Buddhist priest, Saicho, is believed to have introduced tea to Japan, when he returned from a visit to China in 805. In Japan tea drinking was considered medicinal, and became closely associated with Zen Buddhism(禅宗).
Tea drinking also spread to Korea and Southeast Asia, and was taken over the Silk Road to Central Asia, Russia, and the Middle East.
Dutch explorers became familiar with tea in the 1590s and were soon importing tea to Europe. In 1657 the British East India Company held the first public sale of tea in England, while that same year Thomas Garraway began offering tea at his London coffee house.
In 1662 tea received a big boost(推进) in England when the Portuguese Catherine of Braganza, married King Charles II and introduced tea drinking to the British court.
Gradually, the British fell in love with tea, and with the sugar that went in it. In 1665, less than 88 tons of sugar was imported to Great Britain. By 1700, it had increased to 10,000 tons of sugar. In 1768 the East India Company imported 10 million pounds of tea to Britain.
1. Tea has been used as a medicine in China for _________.
A. about 8,000 years      B. about 4,700 years     
C. about 2,200 years      D. about 2,700 years
2. Tea began to spread as a popular drink in China because of _______.
A. the Silk Road              B. the basic necessities of Chinese life
C. a famous book about tea   D. its association with Zen Buddhism
3. According to the text, we can infer that Britain________.
A. first introduced tea to Europe
B. was the first country to trade with China for tea
C. was the first country to have learned about tea from China
D. may be the biggest imported country of tea in Europe even today
4. What is the text mainly about?
A. The history of tea             B. How tea was introduced to other countries
C. China is the home of tea   D. The importance of tea