单选题：Can you give a concrete example to support your idea?

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题目内容：
Can you give a concrete example to support your idea?
A．specific
B．real
C．special
D．good
参考答案：
答案解析：

小军帮哥哥卖报纸，如果哥哥单独卖，7个半小时可以卖完，小军单独卖，12小时可以卖完，现在两人一起卖，工作效率提高了20%

小军帮哥哥卖报纸，如果哥哥单独卖，7个半小时可以卖完，小军单独卖，12小时可以卖完，现在两人一起卖，工作效率提高了20%。当卖掉78%时，突然开始下雨，使得每小

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Soy product may reduce the risk of heart disease.

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It is wrong to think that a healthy doctor-patient relations

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