【单选题】

Passage Four H5N1 avian influence, known commonly as bird flu, has killed at least 15 people acrossAsia and was confirmed inChina on January 27. No human cases have been found in the mainland, but 13 of the country’s 31 provinces, autonomous regions, and municipalities (直辖市) have reported the disease in poultry. TheChinese government has taken measures to prevent and control the disease. Poultry within 3 km of infected farms is to be killed and those within 5 km to receive vaccines (疫苗). (84){{U}}Meanwhile , there will be constant monitoring and daily reports on the disease across the country, and increased production of bird flu vaccines.{{/U}}Among theAsian countries and regions affected by bird flue in animals, only Vietnam and Thailand have reported human cases. The people infected were reported to have caught the disease from poultry, while the World Health Organization (WHO) said there is "no proof of human-to-human transmission(传播)" of bird flue. (85){{U}}The big fear is that the disease could combine with a human influenza virus to create a deadly new disease that will kill millions of people across the globe.{{/U}} ManyAsian farmers live closely with their animals and sell live chickens in the market. This greatly increases the possibility of human beings infected with bird flu.

A、spokesman of the WHO said thatAsian countries affected by bird flu should introduce a more healthy way of raising and selling chickens.And the people there have to complexly change their lifestyle and attitude towards animals. Here are some safety measures for people to stay healthy; Keep fit and well through regular exercise; Avoid infected poultry and infected people; Avoid eating raw or under-done poultry and eggs; Make sure there is always fresh air in your home; Cover your mouth and nose when coughing or sneezing; Wash your hands frequently; From the passage, we can learn that __________ .
A、infected poultry within 3 km was killed inChin
A、
Bird flu case was confirmed inChina on Jan,27.
C．Human cases were found 13Asian countries
D．Over two thirds ofChina has been infected with bird flu