题目内容：
请在第__(57)__处填上正确答案。
A．unhealthy B．strong
C．different
D．doubtful
参考答案：
答案解析：
单选题：请在第__(57)__处填上正确答案。
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B．strong
C．different
D．doubtful
B．strong
C．different
D．doubtful
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