单项选择题

Which is the main idea of the passage（）

A. WHO raised the pandemic flu alert to level 6.
B. H1N1 spreads quickly around the world.
C. WHO requires all countries launch pandemic-prevention plans.
D. H1N1 is going to infect more and more people.

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单项选择题

National Academy of Sciences holds the stance that （）.

A. DNA testing should be systematized
B. only authorized laboratories can conduct DNA testing
C. the academy only is authorized to work out standards for testing
D. the academy has the right to accredit laboratories for DNA testing

单项选择题

40（）

A. longed to
B. long to
C. longing to
D. longed for