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【参考答案】

scientists
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单项选择题
A.blue.B.green.C.white.D.red.
A.blue.
B.green.
C.white.
D.red.
单项选择题
A.at the back of the plane.B.in aisle seats.C.in window seats.D.near to the toilets.
A.at the back of the plane.
B.in aisle seats.
C.in window seats.
D.near to the toilets.
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