单项选择题


A．possible
B．impossible
C．good
D．bad
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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．discoverB．look forC．uncoverD．search for
A．discover
B．look for
C．uncover
D．search for
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