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.
参考答案C
解析:
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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.
单选题
According to the passage, the island's deafness rate has fallen in the twentieth century because
A．the patterns of marriage have changed.
B．many deaf people have regained their hearing.
C．most of the original population has left the island.
D．the island has become famous for its research facilities.