单项选择题

According to the writer, living things on Earth have included（）

A．atoms and molecules
B．chemicals
C．plants, fish, dinosaurs and human beings
D．the primitive soup

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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

单项选择题

What does deposit (L.2, ParA．4) probably mean（）

A. Put in.
B. Take out.
C. Change,
D. Possess.