单选题 Japanese officials are struggling to prevent the spread of mad cow disease. Japan"s first case of mad cow disease was reported in September. The Agriculture Ministry confirmed last month that a second cow was infected. Japan is the only country in Asia where mad cow disease is known to have spread.
Scientists believe cows get the disease by eating meat and bone meal from infected animals. Since September, Japan has banned imports and use of feed made from animal remains. Recently, the Agriculture Ministry announced plans to destroy about 5,000 cows that may have been given the feed. Sales of Japanese beef products have dropped sharply in the past 3 months. Since October, Japanese officials have tested all cows that are killed for their meat. Some scientists question the testing. They say the disease often cannot be identified in young animals. Scientists believe eating infected meat may cause a similar brain disease in humans. This deadly disease is called Creutzfeldt-Jakob disease. It cannot be cured.
About 100 people in Europe have died from Creutzfeldt-Jakob disease in recent years. Most of them have been in Britain. Researchers from France say evidence shows that young people are more likely to become infected. In Britain, the average age of those who died is 28. Only a few victims were older than 50. From this evidence, the team says the probability of a person becoming infected decreases with age .

单选题 How many cases of mad cow disease had been confirmed in Japan?

单选题 In order to prevent the spread of mad cow disease, the Japanese government will or have done the following EXCEPT ______.

单选题 According to the passage, what is some scientists" attitude to the testing of all the cows that are killed for their meat?

单选题 Which of the following statements is TRUE according to the passage?

单选题 What can be inferred from the passage?