单项选择题

A．They were created by Galileo in 1610.
B．They are electrical in nature.
C．They are created by nature.
D．They are there for almost thousands of years.
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The nutrients of particular concern to breastfeeding mothers are: calcium, foliate, zinc, magnesium,______and vitamin B6.
单项选择题
A．At a laboratory.B．At a bank.C．In a classroom.D．In a department store.
A．At a laboratory.
B．At a bank.
C．In a classroom.
D．In a department store.
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