The US spends twice as much on health care as other rich countries. The study involved 5 countries and lasted 5 years.

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问题 The US spends twice as much on health care as other rich countries.
The study involved 5 countries and lasted 5 years.

选项 A、Right
B、Wrong
C、Not mentioned

答案A

解析 从文章的第二、七两段可以得知,该项研究涉及五个国家,历时五年。
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