单项选择题

In the case of a family in Vietnam, ______.

A．WHO said all of the members contracted the bird flu
B．experts think it's possibly caused by the spread of bird flu
C．three of them fell ill due to a serious unidentified disease
D．the sisters caught a disease after tests were done on them
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单项选择题
What is the main idea of this passage
A．WHO claims to be cautious of the spread of bird flu.
B．Hong Kong has made great progress in the research of HSN1 virus.
C．vietnam becomes the most serious infectious area of bird flu.
D．Experts study a possible human-to-human bird flu case in Vietnam.
单项选择题
How do WHO experts react to this special case in Vietnam
A．They have confirmed that the sisters in the case were infected from poultry.
B．They link all the members in the family to contact with sick birds.
C．They are quite doubtful of the possibility of human-to-human transmission.
D．They feel astonished because it's the first time they found such a case.
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