单项选择题

Passage One
Questions 26 to 29 are based on the passage you have just heard.

A．Both of them consist of different groups.
B．The basic unit of each society is the family.
C．Different individuals have different jobs.
D．Both of them consist of families.
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单项选择题
A．To determine whether-or-not they should.B．To process slowly and with caution.C．To have a muscle check.D．To increase heart rate.
A．To determine whether-or-not they should.
B．To process slowly and with caution.
C．To have a muscle check.
D．To increase heart rate.
单项选择题
When the author said he was lucky , it means the following except ______.
A．the topic he found in a book a century ago is so strange
B．he often finds that the past has valuable lessons for the future
C．there are many books on electric vehicles in the 20th century
D．books published before 1923 are in the public domain
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