The passage focuses on ______. We understand from the passage that the United States ______.

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问题 The passage focuses on ______.
We understand from the passage that the United States ______.

选项 A、is rich in low-grade aluminum-bearing ores
B、is short of aluminum-making techniques
C、has to import ninety percent of its annual need of aluminum
D、has to produce fifty percent of the world’s supply to meet its annual aluminum demand

答案A

解析 这是一个细节题,答案依据是第一段第四句Poorer ores are abundant in the United States。
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