单项选择题
A.on the surface
B.at the surface
C.on surface
D.at surface
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单项选择题
A.applyB.adaptC.takeD.conduct
A.apply
B.adapt
C.take
D.conduct
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单项选择题
A.elementaryB.crucialC.rudimentaryD.fundamental
A.elementary
B.crucial
C.rudimentary
D.fundamental
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