单项选择题

The mad moments in the first paragraph refers to the time when we ______.

A．have some mental problems
B．have lost our important things
C．don't listen to what our friends tell us to do
D．fail to remember what should be remembered
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单项选择题
According to the passage, ____.
A．the game plan for keeping brain cells sparking doesn't work for everyone
B．Dr. Small's memory tests can show you what to do about brain aging
C．Dr. Small's advice can help us fight brain aging effectively
D．our brains can reconstruct memories themselves
单项选择题
According to Dr. Small, ______
A．left-handers may start brain aging later than right-handers do
B．learning a foreign language does not help to keep our brain from getting old
C．doing crossword puzzles is the best way to keep us from memory loss
D．mental exercises plus healthy diet alone cannot keep us from brain aging
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