What may be the oldest fossil footprint yet found was discovered in June 1968 by

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问题 What may be the oldest fossil footprint yet found was discovered in June 1968 by William J. Meister, a non-professional fossil collector.

选项 A、a part-time
B、a spare-time
C、an untrained
D、an amateur

答案 D

解析形容词辨析。A．a part-time部分时间的，非全日的，兼职、兼任的；B．a spare-time；C．an untrained未经训练的；D．an amateur业余爱好者；而non-professional非专业的，非职业的，因此D是答案。

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