单项选择题

A．They can do better than others.
B．It is expensive to hire labor.
C．They do not like to be helped.
D．They do not trust others.
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单项选择题
A．150 years ago.B．60 million years ago.C．16 million years ago.D．150 million years ago.
A．150 years ago.
B．60 million years ago.
C．16 million years ago.
D．150 million years ago.
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