单项选择题

What is the passage mainly about

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

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单项选择题

Good looks cut both ways for women (Par

A．5) means that______.A. attractive women have tremendous potential impact on public jobB. good-looking women always get the best of everythingC. being attractive is not always an advantage for womenD. attractive women do not do as well as unattractive women in managerial positions

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I______ this book in a secondhand bookstore on Nanjing Road.

A．came into
B．came about
C．came round
D．came across