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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热门试题

单项选择题

People who are cognitively healthy are those

A．who are highly intelligent
B．whose minds ate alert and receptive
C．who can remember large amounts of information
D．who are good at recognizing different sounds

单项选择题

Older people are generally advised to ______ .

A．keep fit by going in for physical activities
B．keep mentally active by challenging their brains
C．maintain mental alertness through specific training
D．maintain a balance between individual and group activities