单项选择题

Harold Urey and Stanley L. Miller did their experiment in order to ______.

A．dissolve some new chemicals
B．find out what may have happened on the Earth 4 billion years ago
C．simulate bolts of lightning on the ancient Earth
D．analyze a liquid

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热门试题

单项选择题

When did scientists come to realize how the atoms and molecules on the Earth mostlikely combined to make living things

A．4 billion years ago.
B．After seven days.
C．Many years ago.
D．In 1953.

单项选择题

This passage mainly discusses ______.

A．the history of computers
B．the different functions of computers
C．the computer in the 21st century
D．scientific breakthroughs in the 21st century