单项选择题

A．The speculations of Thales.
B．The forces of electricity, magnetism, land gravity.
C．Aristotle’s natural science.
D．Galileo’s discoveries.
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A．Sugar.B．Fat.C．Calorie.D．Protein.
A．Sugar.
B．Fat.
C．Calorie.
D．Protein.
单项选择题
A．Three weeks.B．Five weeks.C．Three months.D．Five months.
A．Three weeks.
B．Five weeks.
C．Three months.
D．Five months.
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