单项选择题

A．A weight-loss surgery.
B．A balanced diet.
C．A change of life style.
D．More exercise.
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单项选择题
What is the main idea of this passage
A．An outbreak of O157:H7
B．Food contamination on a rise.
C．A case report on food poisoning
D．The flaws in the system of beef inspection
单项选择题
A．20 million.B．200 million.C．400 million. D．40 million.
A．20 million.
B．200 million.
C．400 million.
D．40 million.
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