单选题
The main idea of the article is that ______.
A、
a visit to a doctor's office may cost as much as $ 15 to $ 50 in U. S.
B、
the cost of medical care is the main reason for the high costs in the U. S.
C、
medical care in the U. S. costs a lot of money because doctors want to be rich
D、
the high cost of tuition in medical schools is one reason for the high cost of medical care in the U. S.
【正确答案】
D
【答案解析】
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