单项选择题

The early Egyptians must have known about ______.

A．the theory of relativity
B．pi
C．The speed of sound
D．pyromancy
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单项选择题
Karel Drbal found that his model pyramid could ______.
A．sharpen razorblades
B．stop ice melting
C．produce strange noises
D．make animals become torpid
单项选择题
Isaac Newton was interested in the pyramid's ______.
A．giant stones
B．color
C．perfect shape
D．size
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