单项选择题

A．At the movie theatre.
B．At a cafeteria.
C．At the Zoo.
D．At the library.
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单项选择题
Since the Industrial Revolution, the quality of books, films and other entertainment products began to decrease.
A．Y
B．N
C．NG
单项选择题
According to the passage, genetic engineering can be used to ______.
A．make crops hardier
B．kill weeds through cross-breeding
C．make crops resistant to chemical fertilizers
D．improve the yield and quality of most crops
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