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

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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

单项选择题

Judging from the fourth paragraph, what does junk mean

A．food like ice-cream.
B．food you don't like.
C．pleasure foods.
D．low-quality foods,