单项选择题

What is the main topic of this news

A．A uniform standard on graduation rates.
B．A global economy.
C．The reform of the current high school system.
D．The National Governors Association.
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单项选择题
What is this news mainly about
A．The growth of tobacco industry.
B．The lawsuit of the government against cigarette makers.
C．The health risks of smoking.
D．The past profits of tobacco industry.
单项选择题
Which of the following statements is NOT true about the bomb blasts in London
A．They destroyed three underground trains.
B．They killed more than 50 people.
C．They all occurred within 50 seconds.
D．They occurred on Saturday.
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