单项选择题

A．Artificial hearts.
B．Telescopes.
C．Microscopes.
D．Radio telescopes.
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单项选择题
A．The relationship between mice, rats and monkeys.B．The relationship between diet and animals.C．The relationship between diet and man.D．The relationship between diet and healt
A．The relationship between mice, rats and monkeys.
B．The relationship between diet and animals.
C．The relationship between diet and man.
D．The relationship between diet and healt
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