单项选择题
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A.It led to many other inventions.
B.Man had no use for it then.
C.There were no wheels in nature.
D.All of the above.
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单项选择题
A.Government funded.B.Private.C.Political.D.None of the above.
A.Government funded.
B.Private.
C.Political.
D.None of the above.
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单项选择题
A.The conversion of volcanic waste to fertilizer.B.The menace of currently dormant volcanoes around Mount Saint Helens.C.The eruption of Mount Saint Helens and its effects on the environment.D.The elimination of volcanic ash by natural means.
A.The conversion of volcanic waste to fertilizer.
B.The menace of currently dormant volcanoes around Mount Saint Helens.
C.The eruption of Mount Saint Helens and its effects on the environment.
D.The elimination of volcanic ash by natural means.
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