单项选择题

—When was the first man with A(H1N1) flu in mainland China known for sure
—______ May 11, 2009.

A. In
B. On
C. For
D. Since
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单项选择题
—I want to buy the book Cold Mountain . Do you know its ______ —Not really. Maybe three dollars.
A. cover
B. size
C. color
D. price
单项选择题
We are sure that scientists will ______ a way to solve the difficult problem.
A. put up
B. come up with
C. look up
D. come up
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