单项选择题


A.however
B.nevertheless
C.so
D.therefore
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单项选择题
A.on the surfaceB.at the surfaceC.on surfaceD.at surface
A.on the surface
B.at the surface
C.on surface
D.at surface
单项选择题
A.elementaryB.crucialC.rudimentaryD.fundamental
A.elementary
B.crucial
C.rudimentary
D.fundamental
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