单项选择题

A．Help them with their studies.
B．Pay them for participating in the study.
C．Employ them as lab assistants.
D．Teach classes at their high school.
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单项选择题
A．They began to lay eggs.B．They changed their migration patterns.C．Their flying ability improved greatly.D．They become warm-blooded.
A．They began to lay eggs.
B．They changed their migration patterns.
C．Their flying ability improved greatly.
D．They become warm-blooded.
填空题
G
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