单项选择题

Regeneration of a part of the body is impossible without

A．general purpose cells.
B．bone cells.
C．muscle cells.
D．skin cells.

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单项选择题

What kind of animal has a greater ability to regenerate a lost part

A．Younger and more highly-developed ones.
B．Younger and less-developed ones.
C．Older and less-developed ones.
D．Older and more highly-developed ones.

单项选择题

In Dr. Rose's test, frogs with cut-off legs

A．didn't survive.
B．began to grow new limbs.
C．bled freely from their open wounds.
D．started to grow tails.

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