单项选择题

A．Identifying and collecting food.
B．Protecting themselves.
C．Eating food.
D．Fighting against the enemies.
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单项选择题
A．They are the parents of young children.B．They are professional storytellers.C．The stories will help them improve their vocabulary.D．The stories are required for a course.
A．They are the parents of young children.
B．They are professional storytellers.
C．The stories will help them improve their vocabulary.
D．The stories are required for a course.
单项选择题
A．Because it changes color in a regular 24-hour rhythm.B．Because it changes color in response to the sun’s rays.C．Because it constantly changes color.D．Because it changes color every hour.
A．Because it changes color in a regular 24-hour rhythm.
B．Because it changes color in response to the sun’s rays.
C．Because it constantly changes color.
D．Because it changes color every hour.
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