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¡¡¡¡91.Chemicals are made from the elements which have been put together in different forms to make wood or glass or rugs or water£¬or even the bones£¬blood£¬and muscles of ourbodies.

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¡¡¡¡92.We notice that every day the sun appears to travel across the sky from east to west£¬but many people have not noticed that the stars also move across the sky in the same direction.

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¡¡¡¡93.The invention of the thermometer£¬the barometer£¬and the hydromter in the sixteenth and seventeenth centuries extended man's capability to observe£¬and sharpened his desire to interpret and to understand.

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¡¡¡¡94.Intelligent beings which are just beginning to develop on remote worlds may be ready to pick up our signals in thousands of years'time£¬or when life on earth has become extinct.

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¡¡¡¡95.When the effect of inductance is such as to cause an induced voltage in the salne circuit in which the changing current is flowing£¬the term self-induction is applied to the phenomenon.

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