单项选择题

"Cold-blooded" means that the core temperature remains close to the ______ temperature "as it rises and falls."

A．amicable
B．amiable
C．ambient
D．ambitious
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单项选择题
Another common ______ about older people is that they are too old to learn new skills.
A．formalities
B．stereotype
C．convention
D．ideal
单项选择题
One of the roles which science plays is that of ______ superstition.
A．cover up
B．casting out
C．building up
D．fence off
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