单项选择题

A．They noticed an apparent change in the position of the North Star.
B．They observed eclipses at different times of the year.
C．They were the first to estimate the distance between heavenly bodies.
D．They wanted to prove that the Earth was fiat.
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单项选择题
A．They blush more readily than women do.B．They’re uncomfortable performing in front of adults.C．They don’ t respond to stress well.D．They blush less frequently than adults do.
A．They blush more readily than women do.
B．They’re uncomfortable performing in front of adults.
C．They don’ t respond to stress well.
D．They blush less frequently than adults do.
单项选择题
A．It held dirt well.B．It was long-lasting.C．It symbolized wealth.D．It was inexpensive.
A．It held dirt well.
B．It was long-lasting.
C．It symbolized wealth.
D．It was inexpensive.
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