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_______
D
22. Nylon, a synthetic done from a combination of water, air, and a by-product of coal,
____ ______________
ABC
was first introduced in 1938.
________
D
23. Ornithology, the study of birds, is one of the major scientific fields in which amateurs
________
A B
play a role in accumulating, researching, and publish data.
___ _____
CD
24. Animation is a technique for creativity the illusion of life in inanimate things.
_____________ ________
A B C D
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