单项选择题

Refined table manners, though less popular than before in current social life,______.

A．are still a must on certain occasions
B．are bound to return sooner or later
C．are still being taught by parents at home
D．can help improve personal relationships

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单项选择题

The main cause of the layoffs in the pottery industry is______.

A．the increased value of the pound
B．the economic recession in Asia
C．the change in people's way of life
D．the fierce competition at home and abroad