阅读下列短文，从每题所给的(A、B、C、D）四个选项中，选出最佳选项。
1 （2010·安徽省利辛二中高三第四次月考） H5N1 avian influenza, known commonly as bird flu, has killed at least 15 people across Asia and was confirmed in China on January 27. No human cases have been found in the main- land but ,13 of the country’s 31 provinces, autonomous regions, and municipalities(直辖市)have reported the disease in poultry(家禽).
The Chinese government has taken measures to prevent and control the disease. Poultry within 3km of infected farms is to be killed and those within 5km vaccinated(进行接种疫苗). Meanwhile, there will be constant monitoring and daily reports on the disease across the country, and increased production of bide flu vaccines.
Among the 11Asia countries and regions affected by bird flu in animals, only Viet Nam and Thailand have reported human cases .The people infected were reported to have caught the disease from poultry，while the World Heath Organization said there is “no proof of human-to-human transmission (传播)”of bird flu.
