PLA is People’s Liberation Army. A. short for B. short of C. short in D. short by 题目和参考答案——青夏教育精英家教网—

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PLA is ________________ People’s Liberation Army.

A. short for　　　 B. short of　　　 C. short in　　　 D. short by

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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 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

His eyes nearly in tears from the crush of fellow travelers at Guangzhou's train station, Hong Tao said things were much better on Sunday, after days of waiting for a train to his home in Hubei province.

"I think it's fine today, and everything is going smoothly," the 28-year-old said. "I thought it would be really crowded but it has turned out to be OK."

Chinese authorities say they expect 1.3 million people to travel out of Guangzhou's train station over the next few days, as they rush to get home by Wednesday, the eve of Lunar New Year.

Hong's optimism may have been helped by the blue skies that emerged over Guangzhou on Sunday for the first time in a week.

Last week, a rare winter storm paralyzed China's transportation system as millions tried to get home to celebrate the holiday — the only chance for many migrant workers to see their families all year.

China's state-run Xinhua news agency said Friday that 95 percent of rail traffic had "returned to normal." But Guangzhou's train station remained packed with a backlog of hundreds of thousands of travelers hoping to get home for the holiday.

A young woman was stepped on in a stampede (人群蜂拥) at the train station Friday, and later died of her injuries, according to Xinhua. Video of the situation on Friday showed crowds of people screaming, elbowing each other, in some cases sobbing and collapsing in the rush to get a slot (狭缝，窄孔) on a train.

China Sunday announced it has organized over 300,000 People's Liberation Army forces to southern China in what it described as a "war on winter weather".

The government also announced a $700 million plan to help farmers whose crops have been destroyed.

6. How many days is it from the day this article was made to the Lunar New Year?

A. Two days. B. Three days. C. Four days. D. Five days.

7. What can we know about the weather condition of last week in Guangzhou?

A. Sunny with blue sky. B. Rainy for a whole week.

C. Heavily snowy. D. Rainy first and snowy now.

8. Why are there so many passengers in Guangzhou’s train station?

A. Because the heavy snow stopped the passengers from leaving the station.

B. Because the passengers didn’t hope to leave the station right now.

C. Because the passengers hoped to leave for their hometown.

D. Because the holiday was coming near.

9. Where is Hong Tao from?

A. Shandong province. B. Hubei province.

C. Guandong province. D. Not mentioned.

10. What can we infer from the passage?

A. On Friday, a young man was dead because of crowds’ elbowing, screaming.

B. China’s Government have arranged the PLA forces to help.

C. The government of China have offered money to help farmers enjoy the new year.

D. Many crops have been destroyed by the crowds of people.

.She has three brothers.___ is a doctor, ___ are PLA men.

A.One…The others B.One..others C.One…the other D.One..the others

Can people change their skin colour without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that 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.

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

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