问答题
We can choose this material as a ________ (那种材料的代替品).
【参考答案】
substitute for that one
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单项选择题
So far, there seems to be no solution in sight as to how the hydrogen can be stored.
A.Y
B.N
C.NG
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填空题
A.matingB.excitingC.wantingD.boring
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