单项选择题

What is the passage mainly about

A．How biochemical changes occur in the human brain.
B．Why people should receive special mental training as they age.
C．How intellectual activities influence brain health.
D．Why people should keep active not only physically but also mentally.

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单项选择题

The main attraction of the Marathon for non-participant is______.

A．the amount of money raised for charity
B．the chance to take part the following year
C．witnessing the contestants' determination
D．a concern with the race' s history

单项选择题

In order to enter the Marathon, participants must______.

A．pay an entrance fee
B．assemble in one specific area
C．be able to run 26 miles, 385 yards
D．compete for the right to take part