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.
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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.
单项选择题
What is the correlation between the mother's age and the time when the child develops insulin-dependent diabetes
A．The younger the mother, the earlier the start of diabetes in the child.
B．The older the mother, the earlier the start of diabetes in the child.
C．The older the mother, the later the start of diabetes in the child.
D．The mother's age has little to do with the time when the child develops insulin-dependent diabetes.
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