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.
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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
单项选择题
The White House describes the temporary worker program as an economic measure of
A．assisting the employers to find suitable persons for high-level jobs
B．being sure to obtain support from the legislation department
C．increasing the tax income collected from all the illegal immigrants
D．making great contributions to the domestic economic growth
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