单选题
The word "subjects" in paragraph 5 means ______.
A、
something to be considered
B、
branches of knowledge studied
C、
persons chosen to be studied in an experiment
D、
any member of a state except the supreme ruler
【正确答案】
C
【答案解析】
[解析] subject指的是研究的对象，也就是“persons chosen to be studied in an experiment”。
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