Question

　　阅读理解：阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项．

　　This question has puzzled scientists since the SARS virus first appeared and spread around the world: Where did it come from?

　　Now, the first clue has appeared. Researchers in Hong Kong and Shenzhen have identified (鉴别) the probable culprit (凶犯) the masked palm civet, a small cat-like mammal that is treated as a delicious dish in some parts of China.

　　After screening many civets and other animals, scientists from the University of Hong Kong and Shenzhen Centre for Disease Control and Prevention, made a discovery. Four of the masked palm civets－which have short fur and black and white stripes on their faces－were carrying the coronavirus (冠状病毒) that causes SARS.

　　The study provides the first suggestion that the SARS virus exists outside a human host. However, many important questions remain. The possibility of animal-to-animal transmission has to be investigated. For example, the presence of the virus could result from eating an infected prey.

　　Yuen Kwok-Yung, a microbiologist at the university, said the virus may have jumped into humans as they raised, killed and cooked the wild animals.

　　The civet is one of the main parts in the usual wildlife dish “dragon-tiger-phoenix soup”, for which wealthy Chinese in Guangdong Province will pay large sums. The soup includes pieces of civet cat and snake.

　　Hong Kong virologist Malik Peiris, who heads the team that first identified the SARS coronavirus, said that if the food was properly cooked, the virus should be killed.

However, he said, it obviously came from the wild animal, and someone could come into contact with it while the live animal was being handled.

　　The findings, announced Friday, caused Chinese officials to ban the sale of the animals to try to stop the spread of the disease and prevent new outbreaks, World Health Organization officials said.

　　News from the WHO website says that it is too early to know how much wild animals cause the transmission of SARS.

1．Scientists have been puzzled since SARS first appeared and spread because ________.

[　　]

A．SARS virus existed outside humans

B．SARS virus came from a cat-like animal

C．they didn't know where SARS virus came from

D．they didn't know how to control SARS virus

2．In order to prevent the spread of the disease, Chinese officials________.

[　　]

A．encourage people to carry on the sale of wild animals

B．ask people to protect wild animals

C．forbid people to sell and buy wild animals

D．ask people to eat wild animals so that they can be more healthy

3．Who was the first to find the clue that shows where the SARS virus comes from?

[　　]

A．World Health Organization officials.

B．Researchers in Hong Kong and Shenzhen.

C．Chinese officials.

D．Wealthy Chinese in Guangdong Province.

4．The passage as a whole is about that ________.

[　　]

A．Chinese officials try their best to ban the sale of the animals

B．it is very certain that wild animals are the source of the SARS virus

C．SARS virus appeared and spread around the world

D．scientists have found the probable source of the SARS virus

Answer 1

答案：C;C;B;D