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【单选题】
重心前移,飞机的失速速度(),阻力()A.
减小，减小
B.
增大，增大
C.
减小，增大
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【单选题】—_________riding our bikes to the park? —Good idea.
A.
How about
B.
Why not
C.
Would we like
D.
Let’s
【单选题】—Could you tell me _______ the bikes this morning? —He did it with the help of his father. [ ]
A.
how did he fix up
B.
how he fixes up
C.
how he fixed up
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