单项选择题

According to the passage, brain cells _________.

A．are highly active.
B．often stop communicating with each other as we. grow old.
C．are unable to process thoughts.
D．are like old married couples.
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单项选择题
According to the passage, humans will benefit from _________ whey they eat them.
A．potent chemicals
B．damaged cells
C．non-polluted fruits
D．antioxidants in plants
单项选择题
In the third paragraph, the word flourish in line four probably means _________.
A．to grow and thrive
B．to make showy motions
C．to pour out
D．to strike noisily.
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