单选题
It is believed that a new technique to ______ will probably be found.
A、
recycle old aluminum products
B、
discover more bauxite ores
C、
make aluminum by putting ore particles under water
D、
take out aluminum magnetically from poorer ores
【正确答案】
D
【答案解析】
[注释] 本题的依据是第一段最后一句，关键部分是Poorer ores，have found a way to obtain aluminum magnetically。
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