[单项选择]

U. S. health officials are increasing surveillance measures at doctors’ offices and international borders to guard against the spread of swine flu. Washington also has begun dispersing medicine from a federal stockpile.
The Centers for Disease Control and Prevention says there have been only mild cases of swine flu in the United States, but experts remain on guard.
Acting agency director, Richard Besser, says the epidemic in Mexico prompted U. S. doctors to begin monitoring actively for possible infections.
"We are asking doctors when they see someone who has flu-like illness who has traveled to an affected region, to do a culture, take a swab in the nose and send it to the lab so we can see: is it influenza, is it this type" he said.
Speaking Sunday at the White House, Besser said the extra detection efforts have enabled officials to find more infections than under normal circumstances. He also says he expects the number of infecti
A. To find more infections than under normal circumstances.
B. To examine if it is influenza or swine flu.
C. To see if the illness is serious.
D. To stop the illness spread to other areas.

U. S. health officials are increasing surveillance measures at doctors’ offices and international borders to guard against the spread of swine flu. Washington also has begun dispersing medicine from a federal stockpile.
The Centers for Disease Control and Prevention says there have been only mild cases of swine flu in the United States, but experts remain on guard.
Acting agency director, Richard Besser, says the epidemic in Mexico prompted U. S. doctors to begin monitoring actively for possible infections.
"We are asking doctors when they see someone who has flu-like illness who has traveled to an affected region, to do a culture, take a swab in the nose and send it to the lab so we can see: is it influenza, is it this type" he said.
Speaking Sunday at the White House, Besser said the extra detection efforts have enabled officials to find more infections than under normal circumstances. He also says he expects the number of infecti
A. There have been serious cases of swine flu in the United States.
B. U. S. health officials are increasing surveillance measures at doctors’ offices.
C. The epidemic happened in Mexico.
D. Experts remained on guard.