单项选择题

A．occur
B．occurs
C．occurring
D．occurred
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单项选择题
A．ecologistB．biologistC．geologistD．anthropologist
A．ecologist
B．biologist
C．geologist
D．anthropologist
单项选择题
A．humanB．humenC．humansD．humens
A．human
B．humen
C．humans
D．humens
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