单选题：Which of ole following best describes Callahan’s attitude to

题目内容：

Which of ole following best describes Callahan’s attitude to anti-ageing technology? A．Optimisti
B．Pessimisti
C．Reserve
D．Negative

参考答案：

答案解析：

Some scientists are working hard at how tide can be harnesse

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仪态包括接待人员的（）。A．站姿和坐姿 B．走姿和修养 C．走姿和气质 D．风度

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发文字号位于发文机关标识下（）。A．不空行 B．空1行 C．空2行 D．空3行

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