Researchers at the University of Toronto believe that An American research estimates that the total sum of money spent in treat

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问题 Researchers at the University of Toronto believe that
An American research estimates that the total sum of money spent in treating ADRs each year is as much as

选项 A、$40,000,000,000.
B、$4,000,000,000.
C、$400,000,000.
D、$40,000,000.

答案B

解析 这是一道数字辨认题,线索在第六段。一个“billion”应理解为“十亿”,故B项是正确答案。
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