单项选择题

Which of the following can reflect the ever-changing ethnic structure of America

A．Sportsman.
B．Audience.
C．Both of them.
D．None of them.
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单项选择题
The author uses the example of cancer patients to show that ______.
A．medical resources are often wasted
B．doctors are helpless against fatal diseases
C．some treatments are too aggressive
D．medical costs are becoming unaffordable
单项选择题
In contrast to the US, Japan and Sweden are funding their medical care ______.
A．more flexibly
B．more extravagantly
C．more cautiously
D．more reasonably
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