单项选择题

What is the estimated number of adults killed by secondhand smoke each year in the United States

A．40,000.
B．50,000.
C．430.
D．15,000.
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单项选择题
What will be the huge psychological shift Trevor mentioned at the end of the passage
A．The other three leaders all support Obama.
B．Obama is an African-American president.
C．None of the four leaders is white.
D．The other three leaders except Obama are from Asian countries.\
单项选择题
What dictates Miss Rowling’s writing
A．The characters.
B．Her ideas.
C．The readers.
D．Her life experiences.
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