单项选择题

The findings of James and other scientists in their work______.

A．remain a theory to be further proved
B．have been challenged by many other experts
C．are practiced by the researchers themselves
D．have been generally accepted

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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.

单项选择题

According to the writer, the Government' s policy on physical education______.

A．should not promote team games at all
B．upholds the principles of the Olympic Games
C．is active in producing successful Marathon participant
D．encourage those qualities pursued by Marathon participants