In the sentence "Aircraft Carders are a powerful and extremely flexible part of a nation’s defense." "flexible" means _____ Com

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问题 In the sentence "Aircraft Carders are a powerful and extremely flexible part of a nation’s defense." "flexible" means _____
Comparing with the world’s oceans, carriers are ______ .

选项 A、expensive
B、patrolling
C、nuclear powered
D、a few

答案D

解析 根据第三段第一句话“…so there are only a few patrolling the world’s oceans today.”来做。
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