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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热门试题

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.

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.