问题
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Pigeons can carry messages for about ______.A．two weeksB．four weeksC．two yearsD．four years
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A．Two nights.B．Two days.C．Four nights.D．Four days.
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How long is the project expected to take？A．Four nights.B．Four weeks.C．Ten days.D．Two weeks
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● TCP／IP communication protocol contains four layers. From bottom to top, the four layers
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In four strokes engine, the cycle of events is completed in four strokes of _____.A.the cy
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● TCP／IP communication protocol contains four layers. From bottom to top, the four layers
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