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A．plant
B．supplant
C．transplant
D．replant
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单项选择题What does the US think is the new post Cold War threat

A．The possible possession of nuclear weapons and missiles by some countries.
B．The possible acquisition of advanced technology by some countries.
C．NATO's hesitation to build new defenses.
D．The new alliance in Southern Europ

单项选择题How can the group carry out their study

A．By using Satellite images, maps, etc.
B．By studying specific fanning methods.
C．By studying the variation of human population.
D．By analyzing the quality of crops.