单项选择题

According to the passage, which is the most probable person to teach you to speak your own language

A．Your father.
B．Your mother.
C．Your soft-spoken female teacher.
D．None of the above.
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单项选择题
Which of the following can be inferred about high - speed photography in the late 1800’s
A．It was a relatively new technology.
B．The necessary equipment was easy to obtain.
C．The resulting photographs are difficult to interpret.
D．It was not fast enough to provide new information.
单项选择题
Why are the photographs mentioned referred to as an experiment
A．The photographs were not very clear.
B．The purpose of the photographs was to explain the process.
C．The photographer used inferior equipment.
D．The photographer thought the cat might be injured.
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