单项选择题

The main purpose of the talk is to ______.

A．illustrate how wheels, cameras and computers were invented
B．discuss how great inventions influence our way of living
C．compare people's attitudes towards new inventions
D．compare inventions of the 19th century with that of the 20th century
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单项选择题
When did people stop inventing
A．In the early 1800's.
B．In the late 1800's.
C．In the second half of the 19th century.
D．In the first part of the 20th century.
单项选择题
The main idea of this talk is about______.
A．how to make a self-analysis when choosing an occupation
B．what to consider when choosing an occupation
C．how to choose a well-paid occupation
D．what to do to survive in the occupational world
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