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单项选择题
A.active
B.resistant
C.tough
D.gradual
单项选择题
A.at
B.by
C.on
D.with
单项选择题
A.sucked
B.swallowed
C.licked
D.digested
单项选择题
A.transparent
B.obvious
C.apparent
D.visible
单项选择题
A.vary
B.withdraw
C.undergo
D.discard
单项选择题
A.segment
B.ingredient
C.contribution
D.episode
单项选择题
A.stable
B.smooth
C.superficial
D.shallow