单项选择题

Passage Three
Questions 33 to 35 are based on the passage you have just heard.

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.
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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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