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 arc difficult to interpret.
D．It was not fast enough to provide new information.
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单项选择题
Why arc 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 injure
单项选择题
How did scientists increase the speed of their perceptions a thousand fold
A．By analyzing photographs.
B．By observing a white cat in a dark room.
C．By dropping a cat from a greater height.
D．By studying Newton' s Laws of motion.
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