A．The couple cook the dishes and the children help them.
B．The husband does the cooking and the wife serves as the waitress.
C．The mother does the cooking while the father and children wait on the guests.
D．A hired cook prepares the dishes and the family members serve the guests.
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A．It was settled more than 300 years ago.
B．Alexander Graham Bell visited there.
C．A large number of its residents were deaf.
D．Each family living there had many children.
A．seventy
B．seventeen
C．twenty-five
D．Thirty
A．establish his laboratory.
B．have a vacation.
C．visit members of his family.
D．study deafness among the families.