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【单选题】
同类产品的不同外观设计属于( )。A.
主观差异
B.
垂直差异
C.
质量差异
D.
水平差异
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【单选题】Before traveling in space, you must know what it might feel like_____in an imaginary environment.
A.
to travel
B.
traveling
C.
to be traveling
D.
travel
【单选题】You must have said something to______ her, as she was crying after talking with you.
A.
defend
B.
offend
C.
confuse
D.
offer
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