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operate
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A．They are better than the modem movies.B．There is more technology in them.C．The technology in them cannot be compared with that of modern ones.D．They are excellent to us now.
A．They are better than the modem movies.
B．There is more technology in them.
C．The technology in them cannot be compared with that of modern ones.
D．They are excellent to us now.
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Scientists will have to ______________________________ (提出增加世界粮食供应的新方法).
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