单项选择题
A.off
B.at
C.with
D.of
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单项选择题
A.observableB.observedC.observantD.observing
A.observable
B.observed
C.observant
D.observing
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单项选择题
A.atmosphereB.gasC.aerialD.liquid
A.atmosphere
B.gas
C.aerial
D.liquid
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